add cacheTag suport

README.md

@@ -15,6 +15,7 @@ This action requires three input parameters:
 The action also accepts some optional input parameters:
 
 * `githubToken`: Your GitHub token, used for caching Docker images in your project's public package registry. Usually this would just be `${{ github.token }}`. This speeds up subsequent builds and is highly recommended.
+* `cacheTag`: An arbitrary string, used to qualify the Docker images cached. Useful if you are building different images for the same `arch`/`distro`.
 * `env`: Environment variables to propagate to the container. YAML, but must begin with a `|` character. These variables will be available in both run and setup.
 * `shell`: The shell to run commands with in the container. Default: `/bin/sh` on Alpine, `/bin/bash` for other distros.
 * `dockerRunArgs`: Additional arguments to pass to `docker run`, such as volume mappings. See [`docker run` documentation](https://docs.docker.com/engine/reference/commandline/run).

action.yml

@@ -17,6 +17,10 @@ inputs:
     description: 'Your GitHub token, used for caching Docker images in your project''s public package registry. Usually this would just be $\{{ github.token }}. This speeds up builds and is highly recommended.'
     required: true
     default: ''
+  cacheTag:
+    description: 'An arbitrary string, used to qualify the Docker images cached. Useful if you are building different images for the same arch/distro.'
+    required: false
+    default: ''
   env:
     description: 'Environment variables to propagate to the container. YAML, but must begin with a | character. These variables will be available in both run and setup.'
     required: false

src/run-on-arch.js

@@ -92,10 +92,15 @@ async function main() {
     });
   }
 
+  let cacheTag = core.getInput('cacheTag');
+  if (!cacheTag) {
+    cacheTag = 'default'
+  }
+
   // Generate a container name slug unique to this workflow
   const containerName = slug([
     'run-on-arch', env.GITHUB_REPOSITORY, env.GITHUB_WORKFLOW,
-    arch, distro,
+    arch, distro, cacheTag,
   ].join('-'));
 
   console.log('Configuring Docker for multi-architecture support')