build: Add Go module cache for GitHub actions (#164)

Adds the cache action to all workflows so that the Go modules can be
pre-cached

Signed-off-by: Marc Lopez <marc5.12@outlook.com>

Author: marclop

.github/workflows/go.yml

@@ -16,6 +16,14 @@ jobs:
     - name: Check out code into the Go module directory
       uses: actions/checkout@v1
 
+    - name: Cache Go Modules
+      uses: actions/cache@v1
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+
     - name: Get dependencies
       run: make vendor
       id: modules

.github/workflows/release.yml

@@ -19,6 +19,14 @@ jobs:
           go-version: 1.13
         id: go
 
+      - name: Cache Go Modules
+        uses: actions/cache@v1
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
       - name: Install hub
         uses: geertvdc/setup-hub@master