Add custom golang setup action for better caching

.github/actions/setup-go/action.yaml

@@ -0,0 +1,39 @@
+name: 'Setup golang with master only caching'
+description: 'A composite action that installs golang, but with a caching strategy that only updates the cache on master branch.'
+inputs:
+  go-version:
+    description: 'Override the version of Go to install.'
+    required: false
+
+runs:
+  using: 'composite'
+  steps:
+    - uses: actions/setup-go@v5
+      if: inputs.go-version == ''
+      with:
+        go-version-file: 'go.mod'  # Just use whatever version is in the go.mod file
+        cache: ${{ github.ref == 'refs/heads/master' }}
+
+    - uses: actions/setup-go@v5
+      if: inputs.go-version != ''
+      with:
+        go-version: ${{ inputs.go-version }}
+        cache: ${{ github.ref == 'refs/heads/master' }}
+
+    - name: Prepare for go cache
+      if: ${{ github.ref != 'refs/heads/master' }}
+      shell: bash
+      run: |
+        echo "GO_CACHE=$(go env GOCACHE)" | tee -a "$GITHUB_ENV"
+        echo "GO_MODCACHE=$(go env GOMODCACHE)" | tee -a "$GITHUB_ENV"
+        echo "GO_VERSION=$(go env GOVERSION | tr -d 'go')" | tee -a "$GITHUB_ENV"
+
+    - name: Setup read-only cache
+      if: ${{ github.ref != 'refs/heads/master' }}
+      uses: actions/cache/restore@v4
+      with:
+        path: |
+          ${{ env.GO_MODCACHE }}
+          ${{ env.GO_CACHE }}
+        # Match the cache key to the setup-go action https://github.com/actions/setup-go/blob/main/src/cache-restore.ts#L34
+        key: setup-go-${{ runner.os }}-${{ env.ImageOS }}-go-${{ env.GO_VERSION }}-${{ hashFiles('go.sum') }}

.github/workflows/test-suite.yaml

@@ -35,12 +35,10 @@ jobs:
         set +x
         VERSION_GOLANG=$(echo $VERSION_GOLANG | sed 's/go//')
         echo "VERSION_GOLANG=${VERSION_GOLANG}" >> "$GITHUB_OUTPUT"
-    - uses: actions/setup-go@v5
+    - name: Install Go
+      uses: ./.github/actions/setup-go
       with:
         go-version: ${{ steps.go-finder.outputs.VERSION_GOLANG }}
-        cache-dependency-path: |
-          **/go.sum
-          **/go.mod
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
     - name: Install OS Packages

.github/workflows/unittest.yaml

@@ -31,9 +31,7 @@ jobs:
       with:
         fetch-depth: 1
     - name: Install Go
-      uses: actions/setup-go@v5
-      with: 
-        go-version-file: 'go.mod'
+      uses: ./.github/actions/setup-go
     - name: Run Unit Tests
       run: | 
         go test -coverpkg=./... -coverprofile=coverage.out ./pkg/... -run Unit