diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index 6d264b50..1929cc4b 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -44,7 +44,6 @@ jobs:
         NODE_COVERALLS_DEBUG: 1
 
   tests:
-    needs: build_and_unit_test
     name: '${{ matrix.os }}: functional tests'
     runs-on: ${{ matrix.os }}
     strategy:
@@ -71,7 +70,7 @@ jobs:
         runVcpkgInstall: true
         # This forces the creation of a new cache entry each time the workflow is run. 
         # It is the same across jobs in the same workflows.
-        appendedCacheKey: ${{ env.GITHUB_RUN_ID }}
+        prependedCacheKey: ${{ env.GITHUB_RUN_ID }}
       env:
         VCPKG_INSTALLED_DIR: ${{ github.workspace }}/vcpkg_installed
 
@@ -88,13 +87,12 @@ jobs:
       uses: actions/checkout@v3
       with:
         submodules: true
-
     - name: basic test for run-vcpkg (not running vcpkg).
       uses: ./
       with:
         vcpkgDirectory: ${{ github.workspace }}/vcpkg
         vcpkgGitCommitId: '14e7bb4ae24616ec54ff6b2f6ef4e8659434ea44'
-        appendedCacheKey: ${{ env.GITHUB_RUN_ID }}
+        prependedCacheKey: ${{ env.GITHUB_RUN_ID }}
 
   finalize_coveralls:
     needs: build_and_unit_test
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 35418e1c..a8a0a18f 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -15,8 +15,8 @@ The software is provided as is, there is no warranty of any kind. All users are
 `run-vcpkg` depends on public NPM packages published by [lukka/run-cmake-vcpkg-action-libs](https://github.com/lukka/run-cmake-vcpkg-action-libs) in the [GitHub Packages registry](https://docs.github.com/en/free-pro-team@latest/packages/using-github-packages-with-your-projects-ecosystem/configuring-npm-for-use-with-github-packages).
 Unexpectedly, a public package still requires authentication when downloading it, hence if you want to `npm install` those packages correctly, you need to obtain a token with `read:packages` scope. Then create in the root of the repository a `.npmrc` file with the following content:
 
-   //npm.pkg.github.com/:_authToken=YOURTOKEN
-   @lukka:registry=https://npm.pkg.github.com/
+    //npm.pkg.github.com/:_authToken=YOURTOKEN
+    @lukka:registry=https://npm.pkg.github.com/
 
 __Note__: **Never commit this `.npmrc` file!**
 
diff --git a/README.md b/README.md
index f042d98d..905560f5 100644
--- a/README.md
+++ b/README.md
@@ -86,6 +86,18 @@ jobs:
           # (i.e. let CMake run `vcpkg install`) using the vcpkg.cmake toolchain.
           # runVcpkgInstall: true
 
+     # The following `run` step is useful to prevent storing partial cache in the GH cache
+     # service.
+     # This is useful when vcpkg is not run at `run-vcpkg`'s runtime, but later when CMake 
+     # is running, e.g. at `run-cmake` runtime. 
+     # Driving the environment variable `RUNVCPKG_NO_CACHE`, at the end of the workflow the  
+     # `run-vcpkg` post step is instructed to not save anything when the workflow has been 
+     # cancelled or it has failed.
+     #- run: |
+     #    echo "RUNVCPKG_NO_CACHE=1" >> $GITHUB_ENV
+     #  if: ${{ failure() || cancelled() }}
+     #  shell: bash
+
       - name: Run CMake consuming CMakePreset.json and vcpkg.json by mean of vcpkg.
         uses: lukka/run-cmake@v10
         with:
@@ -108,8 +120,8 @@ jobs:
     #  VCPKG_ENABLE_METRICS: 1 
     #
     #  [OPTIONAL] Define the vcpkg's triplet you want to enforce, otherwise the default one
-    #  for the hosting system will be automatically choosen (x64 is the default on all platforms,
-    #  e.g. `x64-osx`).
+    #  for the hosting system will be automatically choosen (x64 is the default on all 
+    #  platforms, e.g. `x64-osx`).
     #  VCPKG_DEFAULT_TRIPLET: ${{ matrix.triplet }} 
 ```
 
@@ -124,9 +136,9 @@ Flowchart with related input in [action.yml](https://github.com/lukka/run-vcpkg/
 ```
 ┌──────────────────────────┐
 │  Compute cache key from: │   Inputs:
-│  - vcpkg Git commit      │   - `appendedCacheKey`
+│  - vcpkg Git commit      │   - `prependedCacheKey` and `appendedCacheKey`
 │  - platform and OS       │   - `vcpkgGitCommitId`
-│  - user provided key     │
+│  - user provided keys    │
 └─────────────┬────────────┘
               │
               ▼
diff --git a/__tests__/functional.test.ts b/__tests__/functional.test.ts
index 37d1521b..e993df7c 100644
--- a/__tests__/functional.test.ts
+++ b/__tests__/functional.test.ts
@@ -48,7 +48,7 @@ describe('run-vcpkg functional tests', () => {
     test('vcpkg setup and install must succeed', () => {
         process.env.INPUT_VCPKGDIRECTORY = vcpkgDirectory;
         process.env.INPUT_VCPKGJSONGLOB = "**/vcpkg.json";
-        process.env.INPUT_VCPKGGITCOMMITID = "b86c0c35b88e2bf3557ff49dc831689c2f085090";
+        process.env.INPUT_VCPKGGITCOMMITID = "6ca56aeb457f033d344a7106cb3f9f1abf8f4e98";
         process.env.INPUT_RUNVCPKGINSTALL = "true";
         process.env.INPUT_RUNVCPKGFORMATSTRING = runvcpkglib.VcpkgRunner.VCPKGINSTALLCMDDEFAULT;
 
@@ -62,7 +62,7 @@ describe('run-vcpkg functional tests', () => {
     test('vcpkg setup and no install must succeed', () => {
         process.env.INPUT_VCPKGDIRECTORY = vcpkgDirectory;
         process.env.INPUT_VCPKGJSONGLOB = "**/vcpkg.json";
-        process.env.INPUT_VCPKGGITCOMMITID = "b86c0c35b88e2bf3557ff49dc831689c2f085090";
+        process.env.INPUT_VCPKGGITCOMMITID = "6ca56aeb457f033d344a7106cb3f9f1abf8f4e98";
         process.env.INPUT_RUNVCPKGINSTALL = "false";
         process.env.INPUT_RUNVCPKGFORMATSTRING = "['invalid command']";
 
@@ -77,7 +77,7 @@ describe('run-vcpkg functional tests', () => {
         delete process.env.INPUT_VCPKGDIRECTORY;
         console.log(process.env.INPUT_VCPKGDIRECTORY);
         delete process.env.INPUT_VCPKGJSONGLOB;
-        process.env.INPUT_VCPKGGITCOMMITID = "b86c0c35b88e2bf3557ff49dc831689c2f085090";
+        process.env.INPUT_VCPKGGITCOMMITID = "6ca56aeb457f033d344a7106cb3f9f1abf8f4e98";
         process.env.INPUT_RUNVCPKGINSTALL = "false";
         process.env.INPUT_RUNVCPKGFORMATSTRING = runvcpkglib.VcpkgRunner.VCPKGINSTALLCMDDEFAULT;
 
@@ -102,7 +102,7 @@ describe('run-vcpkg functional tests', () => {
         await actionLib.rmRF(await runvcpkglib.getDefaultVcpkgInstallDirectory(baseLibUtils.baseLib));
         await actionLib.rmRF(await runvcpkglib.getDefaultVcpkgCacheDirectory(baseLibUtils.baseLib));
         
-        process.env.INPUT_VCPKGGITCOMMITID = "b86c0c35b88e2bf3557ff49dc831689c2f085090";
+        process.env.INPUT_VCPKGGITCOMMITID = "6ca56aeb457f033d344a7106cb3f9f1abf8f4e98";
         process.env.INPUT_RUNVCPKGINSTALL = "true";
         process.env.INPUT_RUNVCPKGFORMATSTRING = runvcpkglib.VcpkgRunner.VCPKGINSTALLCMDDEFAULT;
 
diff --git a/__tests__/unit.test.ts b/__tests__/unit.test.ts
index d339fc95..492b30b1 100644
--- a/__tests__/unit.test.ts
+++ b/__tests__/unit.test.ts
@@ -157,6 +157,7 @@ test('run-vcpkg: cache hit', async () => {
         function (a, b, c): Promise<string> { return Promise.resolve(primaryHitKey); });
     process.env.INPUT_VCPKGDIRECTORY = "/var/tmp/vcpkg";
     process.env.INPUT_APPENDEDCACHEKEY = "appendedCacheKey";
+    process.env.INPUT_PREPENDEDCACHEKEY = "prependedCacheKey";
 
     // Act.
     const vcpkg: vcpkgaction.VcpkgAction = new vcpkgaction.VcpkgAction(baseUtil);
@@ -299,10 +300,10 @@ test('getVcpkgCommitId() tests', async () => {
 test('computeCacheKey(): vcpkg not as a submodule (no commit id user provided and no vcpkg.json found)', async () => {
     // Arrange.
     const expected: baseutil.KeySet = {
-        "primary": "runnerOS=imageos42-vcpkgGitCommit=1234_appendedKey=appendedCacheKey",
+        "primary": "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=1234_appendedKey=appendedCacheKey",
         "restore":
             [
-                "runnerOS=imageos42-vcpkgGitCommit=1234"
+                "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=1234"
             ]
     };
     process.env.ImageOS = "imageos";
@@ -321,7 +322,8 @@ test('computeCacheKey(): vcpkg not as a submodule (no commit id user provided an
         null,
         ".",
         "",
-        "appendedCacheKey")).toStrictEqual(expected);
+        "appendedCacheKey",
+        "prependedCacheKey")).toStrictEqual(expected);
     expect(warningMock).toBeCalledTimes(0);
 
     // Cleanup.
@@ -332,11 +334,11 @@ test('computeCacheKey(): vcpkg not as a submodule (no commit id user provided an
 test('computeCacheKey(): vcpkg not as a submodule (no commit id user provided)', async () => {
     // Arrange.
     const expected: baseutil.KeySet = {
-        "primary": "runnerOS=imageos42-vcpkgGitCommit=1234_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json_appendedKey=appendedCacheKey",
+        "primary": "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=1234_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json_appendedKey=appendedCacheKey",
         "restore":
             [
-                "runnerOS=imageos42-vcpkgGitCommit=1234_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json",
-                "runnerOS=imageos42-vcpkgGitCommit=1234"
+                "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=1234_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json",
+                "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=1234"
             ]
     };
     process.env.ImageOS = "imageos";
@@ -353,7 +355,8 @@ test('computeCacheKey(): vcpkg not as a submodule (no commit id user provided)',
         "hash-of-vcpkg-configuration.json",
         ".",
         "",
-        "appendedCacheKey")).toStrictEqual(expected);
+        "appendedCacheKey",
+        "prependedCacheKey")).toStrictEqual(expected);
     expect(warningMock).toBeCalledTimes(0);
 
     // Cleanup.
@@ -363,11 +366,11 @@ test('computeCacheKey(): vcpkg not as a submodule (no commit id user provided)',
 test('computeCacheKey(): vcpkg as a submodule (no commit id user provided)', async () => {
     // Arrange.
     const expected: baseutil.KeySet = {
-        "primary": "runnerOS=imageos42-vcpkgGitCommit=5678_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json_appendedKey=appendedCacheKey",
+        "primary": "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=5678_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json_appendedKey=appendedCacheKey",
         "restore":
             [
-                "runnerOS=imageos42-vcpkgGitCommit=5678_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json",
-                "runnerOS=imageos42-vcpkgGitCommit=5678"
+                "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=5678_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json",
+                "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=5678"
             ]
     };
     process.env.ImageOS = "imageos";
@@ -384,7 +387,8 @@ test('computeCacheKey(): vcpkg as a submodule (no commit id user provided)', asy
         "hash-of-vcpkg-configuration.json",
         ".",
         "",
-        "appendedCacheKey")).toStrictEqual(expected);
+        "appendedCacheKey",
+        "prependedCacheKey")).toStrictEqual(expected);
     expect(warningMock).toBeCalledTimes(0);
 
     // Cleanup.
@@ -394,11 +398,11 @@ test('computeCacheKey(): vcpkg as a submodule (no commit id user provided)', asy
 test('computeCacheKey(): vcpkg as a submodule, with user provided Git commit id, it must trigger a warning', async () => {
     // Arrange.
     const expected: baseutil.KeySet = {
-        "primary": "runnerOS=imageos42-vcpkgGitCommit=0912_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json_appendedKey=appendedCacheKey",
+        "primary": "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=0912_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json_appendedKey=appendedCacheKey",
         "restore":
             [
-                "runnerOS=imageos42-vcpkgGitCommit=0912_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json",
-                "runnerOS=imageos42-vcpkgGitCommit=0912"
+                "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=0912_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json",
+                "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=0912"
             ]
     };
     process.env.ImageOS = "imageos";
@@ -415,7 +419,8 @@ test('computeCacheKey(): vcpkg as a submodule, with user provided Git commit id,
         "hash-of-vcpkg-configuration.json",
         path.resolve("."),
         "vcpkgcommitid",
-        "appendedCacheKey")).toStrictEqual(expected);
+        "appendedCacheKey",
+        "prependedCacheKey")).toStrictEqual(expected);
     expect(warningMock).toBeCalledTimes(1);
     vcpkgCommitIdMock.mockClear();
 });
@@ -423,10 +428,10 @@ test('computeCacheKey(): vcpkg as a submodule, with user provided Git commit id,
 test('computeCacheKey(): vcpkg with user provided commit it must not trigger a warning', async () => {
     // Arrange.
     const expected: baseutil.KeySet = {
-        "primary": "runnerOS=imageos42-vcpkgGitCommit=userId_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json_appendedKey=appendedCacheKey",
+        "primary": "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=userId_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json_appendedKey=appendedCacheKey",
         "restore": [
-            "runnerOS=imageos42-vcpkgGitCommit=userId_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json",
-            "runnerOS=imageos42-vcpkgGitCommit=userId"]
+            "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=userId_vcpkgJson=hash-of-vcpkg.json-vcpkgConfigurationJson=hash-of-vcpkg-configuration.json",
+            "prependedKey=prependedCacheKey-runnerOS=imageos42-vcpkgGitCommit=userId"]
     };
     process.env.ImageOS = "imageos";
     process.env.ImageVersion = "42";
@@ -442,6 +447,7 @@ test('computeCacheKey(): vcpkg with user provided commit it must not trigger a w
         "hash-of-vcpkg-configuration.json",
         "/Users/luca/github/run-vcpkg/__tests__/assets/",
         "userId",
-        "appendedCacheKey")).toStrictEqual(expected);
+        "appendedCacheKey",
+        "prependedCacheKey")).toStrictEqual(expected);
     expect(warningMock).toBeCalledTimes(0);
 });
diff --git a/action.yml b/action.yml
index 3f7cc193..7a7d6a01 100644
--- a/action.yml
+++ b/action.yml
@@ -16,6 +16,9 @@ inputs:
     default: false
     required: false
     description: "Run the installation of package by running `vcpkg install` on the directory of the discovered 'vcpkg.json' file. Default is false."
+  prependedCacheKey:
+    required: false
+    description: "Specify a value to prepend to the cache key."
   appendedCacheKey:
     required: false
     description: "Specify a value to append to the cache key."
diff --git a/dist/index.js b/dist/index.js
index 71c3946a..22012fa6 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -72,7 +72,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.VcpkgAction = exports.VCPKG_SUCCESS_STATE = exports.VCPKG_ADDITIONAL_CACHED_PATHS_STATE = exports.VCPKG_ROOT_STATE = exports.VCPKG_ADDED_CACHEKEY_STATE = exports.VCPKG_DO_NOT_CACHE_STATE = exports.VCPKG_KEY_CACHE_HIT_STATE = exports.VCPKG_CACHE_COMPUTEDKEY_STATE = exports.logCollectionRegExpsInput = exports.appendedCacheKeyInput = exports.vcpkgUrlInput = exports.doNotUpdateVcpkgInput = exports.vcpkgCommitIdInput = exports.vcpkgDirectoryInput = exports.runVcpkgFormatStringInput = exports.runVcpkgInstallInput = exports.vcpkgJsonIgnoresInput = exports.vcpkgJsonGlobInput = exports.binaryCachePathInput = exports.additionalCachedPathsInput = exports.doNotCacheInput = void 0;
+exports.VcpkgAction = exports.VCPKG_SUCCESS_STATE = exports.VCPKG_ADDITIONAL_CACHED_PATHS_STATE = exports.VCPKG_ROOT_STATE = exports.VCPKG_ADDED_CACHEKEY_STATE = exports.VCPKG_DO_NOT_CACHE_STATE = exports.VCPKG_KEY_CACHE_HIT_STATE = exports.VCPKG_CACHE_COMPUTEDKEY_STATE = exports.logCollectionRegExpsInput = exports.prependedCacheKeyInput = exports.appendedCacheKeyInput = exports.vcpkgUrlInput = exports.doNotUpdateVcpkgInput = exports.vcpkgCommitIdInput = exports.vcpkgDirectoryInput = exports.runVcpkgFormatStringInput = exports.runVcpkgInstallInput = exports.vcpkgJsonIgnoresInput = exports.vcpkgJsonGlobInput = exports.binaryCachePathInput = exports.additionalCachedPathsInput = exports.doNotCacheInput = void 0;
 const path = __nccwpck_require__(5622);
 const cache = __nccwpck_require__(7799);
 const runvcpkglib = __nccwpck_require__(4393);
@@ -93,6 +93,7 @@ exports.vcpkgUrlInput = "VCPKGGITURL";
  * The input's name for additional content for the cache key.
  */
 exports.appendedCacheKeyInput = 'APPENDEDCACHEKEY';
+exports.prependedCacheKeyInput = 'PREPENDEDCACHEKEY';
 exports.logCollectionRegExpsInput = 'LOGCOLLECTIONREGEXPS';
 // Saved data in the action, and consumed by post-action.
 exports.VCPKG_CACHE_COMPUTEDKEY_STATE = "VCPKG_CACHE_COMPUTEDKEY_STATE";
@@ -104,25 +105,26 @@ exports.VCPKG_ADDITIONAL_CACHED_PATHS_STATE = "VCPKG_ADDITIONAL_CACHED_PATHS_STA
 exports.VCPKG_SUCCESS_STATE = "VCPKG_SUCCESS_STATE";
 class VcpkgAction {
     constructor(baseUtilLib) {
-        var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _o;
+        var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _o, _p;
         this.baseUtilLib = baseUtilLib;
         this.doNotCache = false;
         // Fetch inputs.
         this.appendedCacheKey = (_a = baseUtilLib.baseLib.getInput(exports.appendedCacheKeyInput, false)) !== null && _a !== void 0 ? _a : null;
+        this.prependedCacheKey = (_b = baseUtilLib.baseLib.getInput(exports.prependedCacheKeyInput, false)) !== null && _b !== void 0 ? _b : null;
         const vcpkgRootDir = baseUtilLib.baseLib.getPathInput(exports.vcpkgDirectoryInput, false, false);
         this.vcpkgRootDir = vcpkgRootDir ? path.normalize(path.resolve(vcpkgRootDir)) : null;
-        this.userProvidedCommitId = (_b = baseUtilLib.baseLib.getInput(exports.vcpkgCommitIdInput, false)) !== null && _b !== void 0 ? _b : null;
-        vcpkgutil.Utils.addCachedPaths(baseUtilLib.baseLib, (_c = baseUtilLib.baseLib.getInput(exports.additionalCachedPathsInput, false)) !== null && _c !== void 0 ? _c : null);
-        this.runVcpkgFormatString = (_d = baseUtilLib.baseLib.getInput(exports.runVcpkgFormatStringInput, false)) !== null && _d !== void 0 ? _d : null;
-        this.vcpkgJsonGlob = (_e = baseUtilLib.baseLib.getInput(exports.vcpkgJsonGlobInput, false)) !== null && _e !== void 0 ? _e : VcpkgAction.VCPKGJSON_GLOB;
-        this.vcpkgJsonIgnores = eval((_f = baseUtilLib.baseLib.getInput(exports.vcpkgJsonIgnoresInput, false)) !== null && _f !== void 0 ? _f : VcpkgAction.VCPKGJSON_IGNORES);
-        this.runVcpkgInstall = (_g = baseUtilLib.baseLib.getBoolInput(exports.runVcpkgInstallInput, false)) !== null && _g !== void 0 ? _g : false;
-        this.doNotCache = (_h = baseUtilLib.baseLib.getBoolInput(exports.doNotCacheInput, false)) !== null && _h !== void 0 ? _h : false;
-        this.doNotUpdateVcpkg = (_j = baseUtilLib.baseLib.getBoolInput(exports.doNotUpdateVcpkgInput, false)) !== null && _j !== void 0 ? _j : false;
-        this.vcpkgUrl = (_k = baseUtilLib.baseLib.getInput(exports.vcpkgUrlInput, false)) !== null && _k !== void 0 ? _k : VcpkgAction.DEFAULTVCPKGURL;
-        this.vcpkgCommitId = (_l = baseUtilLib.baseLib.getInput(exports.vcpkgCommitIdInput, false)) !== null && _l !== void 0 ? _l : null;
-        this.logCollectionRegExps = (_m = baseUtilLib.baseLib.getDelimitedInput(exports.logCollectionRegExpsInput, ';', false)) !== null && _m !== void 0 ? _m : [];
-        this.binaryCachePath = (_o = baseUtilLib.baseLib.getPathInput(exports.binaryCachePathInput, false, true)) !== null && _o !== void 0 ? _o : null;
+        this.userProvidedCommitId = (_c = baseUtilLib.baseLib.getInput(exports.vcpkgCommitIdInput, false)) !== null && _c !== void 0 ? _c : null;
+        vcpkgutil.Utils.addCachedPaths(baseUtilLib.baseLib, (_d = baseUtilLib.baseLib.getInput(exports.additionalCachedPathsInput, false)) !== null && _d !== void 0 ? _d : null);
+        this.runVcpkgFormatString = (_e = baseUtilLib.baseLib.getInput(exports.runVcpkgFormatStringInput, false)) !== null && _e !== void 0 ? _e : null;
+        this.vcpkgJsonGlob = (_f = baseUtilLib.baseLib.getInput(exports.vcpkgJsonGlobInput, false)) !== null && _f !== void 0 ? _f : VcpkgAction.VCPKGJSON_GLOB;
+        this.vcpkgJsonIgnores = eval((_g = baseUtilLib.baseLib.getInput(exports.vcpkgJsonIgnoresInput, false)) !== null && _g !== void 0 ? _g : VcpkgAction.VCPKGJSON_IGNORES);
+        this.runVcpkgInstall = (_h = baseUtilLib.baseLib.getBoolInput(exports.runVcpkgInstallInput, false)) !== null && _h !== void 0 ? _h : false;
+        this.doNotCache = (_j = baseUtilLib.baseLib.getBoolInput(exports.doNotCacheInput, false)) !== null && _j !== void 0 ? _j : false;
+        this.doNotUpdateVcpkg = (_k = baseUtilLib.baseLib.getBoolInput(exports.doNotUpdateVcpkgInput, false)) !== null && _k !== void 0 ? _k : false;
+        this.vcpkgUrl = (_l = baseUtilLib.baseLib.getInput(exports.vcpkgUrlInput, false)) !== null && _l !== void 0 ? _l : VcpkgAction.DEFAULTVCPKGURL;
+        this.vcpkgCommitId = (_m = baseUtilLib.baseLib.getInput(exports.vcpkgCommitIdInput, false)) !== null && _m !== void 0 ? _m : null;
+        this.logCollectionRegExps = (_o = baseUtilLib.baseLib.getDelimitedInput(exports.logCollectionRegExpsInput, ';', false)) !== null && _o !== void 0 ? _o : [];
+        this.binaryCachePath = (_p = baseUtilLib.baseLib.getPathInput(exports.binaryCachePathInput, false, true)) !== null && _p !== void 0 ? _p : null;
     }
     run() {
         return __awaiter(this, void 0, void 0, function* () {
@@ -156,7 +158,7 @@ class VcpkgAction {
             let vcpkgJsonFilePath = null;
             yield this.baseUtilLib.wrapOp('Compute vcpkg cache key', () => __awaiter(this, void 0, void 0, function* () {
                 const [vcpkgJsonFile, vcpkgJsonHash, vcpkgConfigurationJsonHash] = yield vcpkgutil.Utils.getVcpkgJsonHash(this.baseUtilLib, this.vcpkgJsonGlob, this.vcpkgJsonIgnores);
-                keys = yield vcpkgutil.Utils.computeCacheKeys(this.baseUtilLib, vcpkgJsonHash, vcpkgConfigurationJsonHash, this.vcpkgRootDir, this.userProvidedCommitId, this.appendedCacheKey);
+                keys = yield vcpkgutil.Utils.computeCacheKeys(this.baseUtilLib, vcpkgJsonHash, vcpkgConfigurationJsonHash, this.vcpkgRootDir, this.userProvidedCommitId, this.appendedCacheKey, this.prependedCacheKey);
                 if (keys) {
                     baseLib.info(`Computed key: ${JSON.stringify(keys)}`);
                     vcpkgJsonFilePath = vcpkgJsonFile;
@@ -180,7 +182,7 @@ class VcpkgAction {
         return __awaiter(this, void 0, void 0, function* () {
             this.baseUtilLib.baseLib.debug("restoreCache()<<");
             if (this.doNotCache) {
-                this.baseUtilLib.baseLib.info(`Skipping as caching is disabled(${exports.doNotCacheInput}: true)`);
+                this.baseUtilLib.baseLib.info(`Skipping saving cache as caching is disabled (${exports.doNotCacheInput}: ${this.doNotCache}).`);
             }
             else {
                 if (!this.vcpkgRootDir)
@@ -336,12 +338,13 @@ class Utils {
             return [null, null, null];
         });
     }
-    static computeCacheKeys(baseUtilLib, vcpkgJsonHash, vcpkgConfJsonHash, vcpkgDirectory, userProvidedCommitId, appendedCacheKey) {
+    static computeCacheKeys(baseUtilLib, vcpkgJsonHash, vcpkgConfJsonHash, vcpkgDirectory, userProvidedCommitId, appendedCacheKey, prependedCacheKey) {
         return __awaiter(this, void 0, void 0, function* () {
             baseUtilLib.baseLib.debug(`computeCacheKeys()<<`);
             const cacheKeySegments = [];
             // Add to the first segment of the key the values of env vars ImageOS and ImageVersion if available.
-            let firstSegment = `runnerOS=${process.env['ImageOS'] ? process.env['ImageOS'] : process.platform}`;
+            let firstSegment = prependedCacheKey ? `prependedKey=${prependedCacheKey}-` : "";
+            firstSegment += `runnerOS=${process.env['ImageOS'] ? process.env['ImageOS'] : process.platform}`;
             firstSegment += process.env['ImageVersion'] || "";
             const [commitId, isSubmodule] = yield Utils.getVcpkgCommitId(baseUtilLib, vcpkgDirectory);
             if (commitId) {
diff --git a/dist/post/index.js b/dist/post/index.js
index 0875cd9f..18a53045 100644
--- a/dist/post/index.js
+++ b/dist/post/index.js
@@ -79,7 +79,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.VcpkgAction = exports.VCPKG_SUCCESS_STATE = exports.VCPKG_ADDITIONAL_CACHED_PATHS_STATE = exports.VCPKG_ROOT_STATE = exports.VCPKG_ADDED_CACHEKEY_STATE = exports.VCPKG_DO_NOT_CACHE_STATE = exports.VCPKG_KEY_CACHE_HIT_STATE = exports.VCPKG_CACHE_COMPUTEDKEY_STATE = exports.logCollectionRegExpsInput = exports.appendedCacheKeyInput = exports.vcpkgUrlInput = exports.doNotUpdateVcpkgInput = exports.vcpkgCommitIdInput = exports.vcpkgDirectoryInput = exports.runVcpkgFormatStringInput = exports.runVcpkgInstallInput = exports.vcpkgJsonIgnoresInput = exports.vcpkgJsonGlobInput = exports.binaryCachePathInput = exports.additionalCachedPathsInput = exports.doNotCacheInput = void 0;
+exports.VcpkgAction = exports.VCPKG_SUCCESS_STATE = exports.VCPKG_ADDITIONAL_CACHED_PATHS_STATE = exports.VCPKG_ROOT_STATE = exports.VCPKG_ADDED_CACHEKEY_STATE = exports.VCPKG_DO_NOT_CACHE_STATE = exports.VCPKG_KEY_CACHE_HIT_STATE = exports.VCPKG_CACHE_COMPUTEDKEY_STATE = exports.logCollectionRegExpsInput = exports.prependedCacheKeyInput = exports.appendedCacheKeyInput = exports.vcpkgUrlInput = exports.doNotUpdateVcpkgInput = exports.vcpkgCommitIdInput = exports.vcpkgDirectoryInput = exports.runVcpkgFormatStringInput = exports.runVcpkgInstallInput = exports.vcpkgJsonIgnoresInput = exports.vcpkgJsonGlobInput = exports.binaryCachePathInput = exports.additionalCachedPathsInput = exports.doNotCacheInput = void 0;
 const path = __nccwpck_require__(5622);
 const cache = __nccwpck_require__(7799);
 const runvcpkglib = __nccwpck_require__(4393);
@@ -100,6 +100,7 @@ exports.vcpkgUrlInput = "VCPKGGITURL";
  * The input's name for additional content for the cache key.
  */
 exports.appendedCacheKeyInput = 'APPENDEDCACHEKEY';
+exports.prependedCacheKeyInput = 'PREPENDEDCACHEKEY';
 exports.logCollectionRegExpsInput = 'LOGCOLLECTIONREGEXPS';
 // Saved data in the action, and consumed by post-action.
 exports.VCPKG_CACHE_COMPUTEDKEY_STATE = "VCPKG_CACHE_COMPUTEDKEY_STATE";
@@ -111,25 +112,26 @@ exports.VCPKG_ADDITIONAL_CACHED_PATHS_STATE = "VCPKG_ADDITIONAL_CACHED_PATHS_STA
 exports.VCPKG_SUCCESS_STATE = "VCPKG_SUCCESS_STATE";
 class VcpkgAction {
     constructor(baseUtilLib) {
-        var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _o;
+        var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _o, _p;
         this.baseUtilLib = baseUtilLib;
         this.doNotCache = false;
         // Fetch inputs.
         this.appendedCacheKey = (_a = baseUtilLib.baseLib.getInput(exports.appendedCacheKeyInput, false)) !== null && _a !== void 0 ? _a : null;
+        this.prependedCacheKey = (_b = baseUtilLib.baseLib.getInput(exports.prependedCacheKeyInput, false)) !== null && _b !== void 0 ? _b : null;
         const vcpkgRootDir = baseUtilLib.baseLib.getPathInput(exports.vcpkgDirectoryInput, false, false);
         this.vcpkgRootDir = vcpkgRootDir ? path.normalize(path.resolve(vcpkgRootDir)) : null;
-        this.userProvidedCommitId = (_b = baseUtilLib.baseLib.getInput(exports.vcpkgCommitIdInput, false)) !== null && _b !== void 0 ? _b : null;
-        vcpkgutil.Utils.addCachedPaths(baseUtilLib.baseLib, (_c = baseUtilLib.baseLib.getInput(exports.additionalCachedPathsInput, false)) !== null && _c !== void 0 ? _c : null);
-        this.runVcpkgFormatString = (_d = baseUtilLib.baseLib.getInput(exports.runVcpkgFormatStringInput, false)) !== null && _d !== void 0 ? _d : null;
-        this.vcpkgJsonGlob = (_e = baseUtilLib.baseLib.getInput(exports.vcpkgJsonGlobInput, false)) !== null && _e !== void 0 ? _e : VcpkgAction.VCPKGJSON_GLOB;
-        this.vcpkgJsonIgnores = eval((_f = baseUtilLib.baseLib.getInput(exports.vcpkgJsonIgnoresInput, false)) !== null && _f !== void 0 ? _f : VcpkgAction.VCPKGJSON_IGNORES);
-        this.runVcpkgInstall = (_g = baseUtilLib.baseLib.getBoolInput(exports.runVcpkgInstallInput, false)) !== null && _g !== void 0 ? _g : false;
-        this.doNotCache = (_h = baseUtilLib.baseLib.getBoolInput(exports.doNotCacheInput, false)) !== null && _h !== void 0 ? _h : false;
-        this.doNotUpdateVcpkg = (_j = baseUtilLib.baseLib.getBoolInput(exports.doNotUpdateVcpkgInput, false)) !== null && _j !== void 0 ? _j : false;
-        this.vcpkgUrl = (_k = baseUtilLib.baseLib.getInput(exports.vcpkgUrlInput, false)) !== null && _k !== void 0 ? _k : VcpkgAction.DEFAULTVCPKGURL;
-        this.vcpkgCommitId = (_l = baseUtilLib.baseLib.getInput(exports.vcpkgCommitIdInput, false)) !== null && _l !== void 0 ? _l : null;
-        this.logCollectionRegExps = (_m = baseUtilLib.baseLib.getDelimitedInput(exports.logCollectionRegExpsInput, ';', false)) !== null && _m !== void 0 ? _m : [];
-        this.binaryCachePath = (_o = baseUtilLib.baseLib.getPathInput(exports.binaryCachePathInput, false, true)) !== null && _o !== void 0 ? _o : null;
+        this.userProvidedCommitId = (_c = baseUtilLib.baseLib.getInput(exports.vcpkgCommitIdInput, false)) !== null && _c !== void 0 ? _c : null;
+        vcpkgutil.Utils.addCachedPaths(baseUtilLib.baseLib, (_d = baseUtilLib.baseLib.getInput(exports.additionalCachedPathsInput, false)) !== null && _d !== void 0 ? _d : null);
+        this.runVcpkgFormatString = (_e = baseUtilLib.baseLib.getInput(exports.runVcpkgFormatStringInput, false)) !== null && _e !== void 0 ? _e : null;
+        this.vcpkgJsonGlob = (_f = baseUtilLib.baseLib.getInput(exports.vcpkgJsonGlobInput, false)) !== null && _f !== void 0 ? _f : VcpkgAction.VCPKGJSON_GLOB;
+        this.vcpkgJsonIgnores = eval((_g = baseUtilLib.baseLib.getInput(exports.vcpkgJsonIgnoresInput, false)) !== null && _g !== void 0 ? _g : VcpkgAction.VCPKGJSON_IGNORES);
+        this.runVcpkgInstall = (_h = baseUtilLib.baseLib.getBoolInput(exports.runVcpkgInstallInput, false)) !== null && _h !== void 0 ? _h : false;
+        this.doNotCache = (_j = baseUtilLib.baseLib.getBoolInput(exports.doNotCacheInput, false)) !== null && _j !== void 0 ? _j : false;
+        this.doNotUpdateVcpkg = (_k = baseUtilLib.baseLib.getBoolInput(exports.doNotUpdateVcpkgInput, false)) !== null && _k !== void 0 ? _k : false;
+        this.vcpkgUrl = (_l = baseUtilLib.baseLib.getInput(exports.vcpkgUrlInput, false)) !== null && _l !== void 0 ? _l : VcpkgAction.DEFAULTVCPKGURL;
+        this.vcpkgCommitId = (_m = baseUtilLib.baseLib.getInput(exports.vcpkgCommitIdInput, false)) !== null && _m !== void 0 ? _m : null;
+        this.logCollectionRegExps = (_o = baseUtilLib.baseLib.getDelimitedInput(exports.logCollectionRegExpsInput, ';', false)) !== null && _o !== void 0 ? _o : [];
+        this.binaryCachePath = (_p = baseUtilLib.baseLib.getPathInput(exports.binaryCachePathInput, false, true)) !== null && _p !== void 0 ? _p : null;
     }
     run() {
         return __awaiter(this, void 0, void 0, function* () {
@@ -163,7 +165,7 @@ class VcpkgAction {
             let vcpkgJsonFilePath = null;
             yield this.baseUtilLib.wrapOp('Compute vcpkg cache key', () => __awaiter(this, void 0, void 0, function* () {
                 const [vcpkgJsonFile, vcpkgJsonHash, vcpkgConfigurationJsonHash] = yield vcpkgutil.Utils.getVcpkgJsonHash(this.baseUtilLib, this.vcpkgJsonGlob, this.vcpkgJsonIgnores);
-                keys = yield vcpkgutil.Utils.computeCacheKeys(this.baseUtilLib, vcpkgJsonHash, vcpkgConfigurationJsonHash, this.vcpkgRootDir, this.userProvidedCommitId, this.appendedCacheKey);
+                keys = yield vcpkgutil.Utils.computeCacheKeys(this.baseUtilLib, vcpkgJsonHash, vcpkgConfigurationJsonHash, this.vcpkgRootDir, this.userProvidedCommitId, this.appendedCacheKey, this.prependedCacheKey);
                 if (keys) {
                     baseLib.info(`Computed key: ${JSON.stringify(keys)}`);
                     vcpkgJsonFilePath = vcpkgJsonFile;
@@ -187,7 +189,7 @@ class VcpkgAction {
         return __awaiter(this, void 0, void 0, function* () {
             this.baseUtilLib.baseLib.debug("restoreCache()<<");
             if (this.doNotCache) {
-                this.baseUtilLib.baseLib.info(`Skipping as caching is disabled(${exports.doNotCacheInput}: true)`);
+                this.baseUtilLib.baseLib.info(`Skipping saving cache as caching is disabled (${exports.doNotCacheInput}: ${this.doNotCache}).`);
             }
             else {
                 if (!this.vcpkgRootDir)
@@ -399,12 +401,13 @@ class Utils {
             return [null, null, null];
         });
     }
-    static computeCacheKeys(baseUtilLib, vcpkgJsonHash, vcpkgConfJsonHash, vcpkgDirectory, userProvidedCommitId, appendedCacheKey) {
+    static computeCacheKeys(baseUtilLib, vcpkgJsonHash, vcpkgConfJsonHash, vcpkgDirectory, userProvidedCommitId, appendedCacheKey, prependedCacheKey) {
         return __awaiter(this, void 0, void 0, function* () {
             baseUtilLib.baseLib.debug(`computeCacheKeys()<<`);
             const cacheKeySegments = [];
             // Add to the first segment of the key the values of env vars ImageOS and ImageVersion if available.
-            let firstSegment = `runnerOS=${process.env['ImageOS'] ? process.env['ImageOS'] : process.platform}`;
+            let firstSegment = prependedCacheKey ? `prependedKey=${prependedCacheKey}-` : "";
+            firstSegment += `runnerOS=${process.env['ImageOS'] ? process.env['ImageOS'] : process.platform}`;
             firstSegment += process.env['ImageVersion'] || "";
             const [commitId, isSubmodule] = yield Utils.getVcpkgCommitId(baseUtilLib, vcpkgDirectory);
             if (commitId) {
diff --git a/package-lock.json b/package-lock.json
index af9c52de..12822da0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1373,9 +1373,9 @@
       }
     },
     "node_modules/@lukka/action-lib/node_modules/ansi-regex": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-      "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.1.tgz",
+      "integrity": "sha512-ILlv4k/3f6vfQ4OoP2AGvirOktlQ98ZEL1k9FaQjxa3L1abBgbuTDAdPOpvbGncC0BTVQrl+OM8xZGK6tWXt7g==",
       "engines": {
         "node": ">=6"
       }
@@ -1817,9 +1817,9 @@
       }
     },
     "node_modules/@lukka/base-lib/node_modules/ansi-regex": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-      "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.1.tgz",
+      "integrity": "sha512-ILlv4k/3f6vfQ4OoP2AGvirOktlQ98ZEL1k9FaQjxa3L1abBgbuTDAdPOpvbGncC0BTVQrl+OM8xZGK6tWXt7g==",
       "engines": {
         "node": ">=6"
       }
@@ -2270,9 +2270,9 @@
       }
     },
     "node_modules/@lukka/run-vcpkg-lib/node_modules/ansi-regex": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-      "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.1.tgz",
+      "integrity": "sha512-ILlv4k/3f6vfQ4OoP2AGvirOktlQ98ZEL1k9FaQjxa3L1abBgbuTDAdPOpvbGncC0BTVQrl+OM8xZGK6tWXt7g==",
       "engines": {
         "node": ">=6"
       }
@@ -4151,13 +4151,19 @@
       }
     },
     "node_modules/caniuse-lite": {
-      "version": "1.0.30001251",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001251.tgz",
-      "integrity": "sha512-HOe1r+9VkU4TFmnU70z+r7OLmtR+/chB1rdcJUeQlAinjEeb0cKL20tlAtOagNZhbrtLnCvV19B4FmF1rgzl6A==",
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/browserslist"
-      }
+      "version": "1.0.30001412",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001412.tgz",
+      "integrity": "sha512-+TeEIee1gS5bYOiuf+PS/kp2mrXic37Hl66VY6EAfxasIk5fELTktK2oOezYed12H8w7jt3s512PpulQidPjwA==",
+      "funding": [
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/browserslist"
+        },
+        {
+          "type": "tidelift",
+          "url": "https://tidelift.com/funding/github/npm/caniuse-lite"
+        }
+      ]
     },
     "node_modules/capture-exit": {
       "version": "2.0.0",
@@ -4224,7 +4230,7 @@
     "node_modules/chokidar/node_modules/glob-parent": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-3.1.0.tgz",
-      "integrity": "sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=",
+      "integrity": "sha512-E8Ak/2+dZY6fnzlR7+ueWvhsH1SjHr4jjss4YS/h4py44jY9MhK/VFdaZJAWDz6BbL21KeteKxFSFpq8OS5gVA==",
       "dev": true,
       "dependencies": {
         "is-glob": "^3.1.0",
@@ -6168,7 +6174,7 @@
     "node_modules/glob-stream": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/glob-stream/-/glob-stream-6.1.0.tgz",
-      "integrity": "sha1-cEXJlBOz65SIjYOrRtC0BMx73eQ=",
+      "integrity": "sha512-uMbLGAP3S2aDOHUDfdoYcdIePUCfysbAd0IAoWVZbeGU/oNQ8asHVSshLDJUPWxfzj8zsCG7/XeHPHTtow0nsw==",
       "dev": true,
       "dependencies": {
         "extend": "^3.0.0",
@@ -6189,7 +6195,7 @@
     "node_modules/glob-stream/node_modules/glob-parent": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-3.1.0.tgz",
-      "integrity": "sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=",
+      "integrity": "sha512-E8Ak/2+dZY6fnzlR7+ueWvhsH1SjHr4jjss4YS/h4py44jY9MhK/VFdaZJAWDz6BbL21KeteKxFSFpq8OS5gVA==",
       "dev": true,
       "dependencies": {
         "is-glob": "^3.1.0",
@@ -6411,9 +6417,9 @@
       }
     },
     "node_modules/gulp-eslint/node_modules/ansi-regex": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-      "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.1.tgz",
+      "integrity": "sha512-ILlv4k/3f6vfQ4OoP2AGvirOktlQ98ZEL1k9FaQjxa3L1abBgbuTDAdPOpvbGncC0BTVQrl+OM8xZGK6tWXt7g==",
       "dev": true,
       "engines": {
         "node": ">=6"
@@ -6868,7 +6874,7 @@
     "node_modules/gulp-install": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/gulp-install/-/gulp-install-1.1.0.tgz",
-      "integrity": "sha1-k4a0bLRmm0cle2rfTj6i6DySiho=",
+      "integrity": "sha512-oH/OHjy74cU8VCdpaGw8S7AX92ETB9Rhc8nucgVIYbp0ihX4CGWLvGDUKN1FGYD25YKHfGcl7jH8sUnuRbbBgA==",
       "dev": true,
       "dependencies": {
         "dargs": "^5.1.0",
@@ -6999,7 +7005,7 @@
     "node_modules/gulp-util": {
       "version": "3.0.8",
       "resolved": "https://registry.npmjs.org/gulp-util/-/gulp-util-3.0.8.tgz",
-      "integrity": "sha1-AFTh50RQLifATBh8PsxQXdVLu08=",
+      "integrity": "sha512-q5oWPc12lwSFS9h/4VIjG+1NuNDlJ48ywV2JKItY4Ycc/n1fXJeYPVQsfu5ZrhQi7FGSDBalwUCLar/GyHXKGw==",
       "deprecated": "gulp-util is deprecated - replace it, following the guidelines at https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5",
       "dev": true,
       "dependencies": {
@@ -7087,7 +7093,7 @@
     "node_modules/gulp-util/node_modules/lodash.template": {
       "version": "3.6.2",
       "resolved": "https://registry.npmjs.org/lodash.template/-/lodash.template-3.6.2.tgz",
-      "integrity": "sha1-+M3sxhaaJVvpCYrosMU9N4kx0U8=",
+      "integrity": "sha512-0B4Y53I0OgHUJkt+7RmlDFWKjVAI/YUpWNiL9GQz5ORDr4ttgfQGo+phBWKFLJbBdtOwgMuUkdOHOnPg45jKmQ==",
       "dev": true,
       "dependencies": {
         "lodash._basecopy": "^3.0.0",
@@ -14152,9 +14158,9 @@
       },
       "dependencies": {
         "ansi-regex": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg=="
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.1.tgz",
+          "integrity": "sha512-ILlv4k/3f6vfQ4OoP2AGvirOktlQ98ZEL1k9FaQjxa3L1abBgbuTDAdPOpvbGncC0BTVQrl+OM8xZGK6tWXt7g=="
         },
         "ansi-styles": {
           "version": "3.2.1",
@@ -14490,9 +14496,9 @@
       },
       "dependencies": {
         "ansi-regex": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg=="
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.1.tgz",
+          "integrity": "sha512-ILlv4k/3f6vfQ4OoP2AGvirOktlQ98ZEL1k9FaQjxa3L1abBgbuTDAdPOpvbGncC0BTVQrl+OM8xZGK6tWXt7g=="
         },
         "ansi-styles": {
           "version": "3.2.1",
@@ -14837,9 +14843,9 @@
       },
       "dependencies": {
         "ansi-regex": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg=="
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.1.tgz",
+          "integrity": "sha512-ILlv4k/3f6vfQ4OoP2AGvirOktlQ98ZEL1k9FaQjxa3L1abBgbuTDAdPOpvbGncC0BTVQrl+OM8xZGK6tWXt7g=="
         },
         "ansi-styles": {
           "version": "3.2.1",
@@ -16283,9 +16289,9 @@
       "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg=="
     },
     "caniuse-lite": {
-      "version": "1.0.30001251",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001251.tgz",
-      "integrity": "sha512-HOe1r+9VkU4TFmnU70z+r7OLmtR+/chB1rdcJUeQlAinjEeb0cKL20tlAtOagNZhbrtLnCvV19B4FmF1rgzl6A=="
+      "version": "1.0.30001412",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001412.tgz",
+      "integrity": "sha512-+TeEIee1gS5bYOiuf+PS/kp2mrXic37Hl66VY6EAfxasIk5fELTktK2oOezYed12H8w7jt3s512PpulQidPjwA=="
     },
     "capture-exit": {
       "version": "2.0.0",
@@ -16337,7 +16343,7 @@
         "glob-parent": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-3.1.0.tgz",
-          "integrity": "sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=",
+          "integrity": "sha512-E8Ak/2+dZY6fnzlR7+ueWvhsH1SjHr4jjss4YS/h4py44jY9MhK/VFdaZJAWDz6BbL21KeteKxFSFpq8OS5gVA==",
           "dev": true,
           "requires": {
             "is-glob": "^3.1.0",
@@ -17867,7 +17873,7 @@
     "glob-stream": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/glob-stream/-/glob-stream-6.1.0.tgz",
-      "integrity": "sha1-cEXJlBOz65SIjYOrRtC0BMx73eQ=",
+      "integrity": "sha512-uMbLGAP3S2aDOHUDfdoYcdIePUCfysbAd0IAoWVZbeGU/oNQ8asHVSshLDJUPWxfzj8zsCG7/XeHPHTtow0nsw==",
       "dev": true,
       "requires": {
         "extend": "^3.0.0",
@@ -17885,7 +17891,7 @@
         "glob-parent": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-3.1.0.tgz",
-          "integrity": "sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=",
+          "integrity": "sha512-E8Ak/2+dZY6fnzlR7+ueWvhsH1SjHr4jjss4YS/h4py44jY9MhK/VFdaZJAWDz6BbL21KeteKxFSFpq8OS5gVA==",
           "dev": true,
           "requires": {
             "is-glob": "^3.1.0",
@@ -18067,9 +18073,9 @@
       },
       "dependencies": {
         "ansi-regex": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.1.tgz",
+          "integrity": "sha512-ILlv4k/3f6vfQ4OoP2AGvirOktlQ98ZEL1k9FaQjxa3L1abBgbuTDAdPOpvbGncC0BTVQrl+OM8xZGK6tWXt7g==",
           "dev": true
         },
         "ansi-styles": {
@@ -18420,7 +18426,7 @@
     "gulp-install": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/gulp-install/-/gulp-install-1.1.0.tgz",
-      "integrity": "sha1-k4a0bLRmm0cle2rfTj6i6DySiho=",
+      "integrity": "sha512-oH/OHjy74cU8VCdpaGw8S7AX92ETB9Rhc8nucgVIYbp0ihX4CGWLvGDUKN1FGYD25YKHfGcl7jH8sUnuRbbBgA==",
       "dev": true,
       "requires": {
         "dargs": "^5.1.0",
@@ -18532,7 +18538,7 @@
     "gulp-util": {
       "version": "3.0.8",
       "resolved": "https://registry.npmjs.org/gulp-util/-/gulp-util-3.0.8.tgz",
-      "integrity": "sha1-AFTh50RQLifATBh8PsxQXdVLu08=",
+      "integrity": "sha512-q5oWPc12lwSFS9h/4VIjG+1NuNDlJ48ywV2JKItY4Ycc/n1fXJeYPVQsfu5ZrhQi7FGSDBalwUCLar/GyHXKGw==",
       "dev": true,
       "requires": {
         "array-differ": "^1.0.0",
@@ -18601,7 +18607,7 @@
         "lodash.template": {
           "version": "3.6.2",
           "resolved": "https://registry.npmjs.org/lodash.template/-/lodash.template-3.6.2.tgz",
-          "integrity": "sha1-+M3sxhaaJVvpCYrosMU9N4kx0U8=",
+          "integrity": "sha512-0B4Y53I0OgHUJkt+7RmlDFWKjVAI/YUpWNiL9GQz5ORDr4ttgfQGo+phBWKFLJbBdtOwgMuUkdOHOnPg45jKmQ==",
           "dev": true,
           "requires": {
             "lodash._basecopy": "^3.0.0",
diff --git a/src/vcpkg-action.ts b/src/vcpkg-action.ts
index c846cc19..ba99dcc3 100644
--- a/src/vcpkg-action.ts
+++ b/src/vcpkg-action.ts
@@ -24,6 +24,7 @@ export const vcpkgUrlInput = "VCPKGGITURL";
  * The input's name for additional content for the cache key.
  */
 export const appendedCacheKeyInput = 'APPENDEDCACHEKEY';
+export const prependedCacheKeyInput = 'PREPENDEDCACHEKEY';
 export const logCollectionRegExpsInput = 'LOGCOLLECTIONREGEXPS';
 
 // Saved data in the action, and consumed by post-action.
@@ -42,6 +43,7 @@ export class VcpkgAction {
   private static readonly DEFAULTVCPKGURL = 'https://github.com/microsoft/vcpkg.git';
   private readonly doNotCache: boolean = false;
   private readonly appendedCacheKey: string | null;
+  private readonly prependedCacheKey: string | null;
   private readonly runVcpkgFormatString: string | null;
   private readonly vcpkgJsonGlob: string;
   private readonly vcpkgJsonIgnores: string[];
@@ -58,6 +60,7 @@ export class VcpkgAction {
   constructor(private readonly baseUtilLib: baseutillib.BaseUtilLib) {
     // Fetch inputs.
     this.appendedCacheKey = baseUtilLib.baseLib.getInput(appendedCacheKeyInput, false) ?? null;
+    this.prependedCacheKey = baseUtilLib.baseLib.getInput(prependedCacheKeyInput, false) ?? null;
     const vcpkgRootDir = baseUtilLib.baseLib.getPathInput(vcpkgDirectoryInput, false, false);
     this.vcpkgRootDir = vcpkgRootDir ? path.normalize(path.resolve(vcpkgRootDir)) : null;
     this.userProvidedCommitId = baseUtilLib.baseLib.getInput(vcpkgCommitIdInput, false) ?? null;
@@ -116,7 +119,8 @@ export class VcpkgAction {
         vcpkgConfigurationJsonHash, 
         this.vcpkgRootDir as string, 
         this.userProvidedCommitId, 
-        this.appendedCacheKey);
+        this.appendedCacheKey,
+        this.prependedCacheKey);
 
       if (keys) {
         baseLib.info(`Computed key: ${JSON.stringify(keys)}`);
@@ -152,7 +156,7 @@ export class VcpkgAction {
   private async restoreCache(keys: baseutillib.KeySet): Promise<void> {
     this.baseUtilLib.baseLib.debug("restoreCache()<<");
     if (this.doNotCache) {
-      this.baseUtilLib.baseLib.info(`Skipping as caching is disabled(${doNotCacheInput}: true)`);
+      this.baseUtilLib.baseLib.info(`Skipping saving cache as caching is disabled (${doNotCacheInput}: ${this.doNotCache}).`);
     } else {
       if (!this.vcpkgRootDir) throw new Error("vcpkg_ROOT must be defined");
       const pathsToCache: string[] = vcpkgutil.Utils.getAllCachedPaths(
diff --git a/src/vcpkg-utils.ts b/src/vcpkg-utils.ts
index 4fe9dde3..60ce7e91 100644
--- a/src/vcpkg-utils.ts
+++ b/src/vcpkg-utils.ts
@@ -90,12 +90,14 @@ export class Utils {
     vcpkgConfJsonHash: string | null,
     vcpkgDirectory: string,
     userProvidedCommitId: string | null,
-    appendedCacheKey: string | null): Promise<baseutillib.KeySet> {
+    appendedCacheKey: string | null,
+    prependedCacheKey: string | null): Promise<baseutillib.KeySet> {
     baseUtilLib.baseLib.debug(`computeCacheKeys()<<`);
     const cacheKeySegments: string[] = [];
 
     // Add to the first segment of the key the values of env vars ImageOS and ImageVersion if available.
-    let firstSegment = `runnerOS=${process.env['ImageOS'] ? process.env['ImageOS'] : process.platform}`;
+    let firstSegment = prependedCacheKey ? `prependedKey=${prependedCacheKey}-` : "";
+    firstSegment += `runnerOS=${process.env['ImageOS'] ? process.env['ImageOS'] : process.platform}`;
     firstSegment += process.env['ImageVersion'] || "";
 
     const [commitId, isSubmodule] = await Utils.getVcpkgCommitId(baseUtilLib, vcpkgDirectory);