GitHub: make setup-go action more versatile

With this commit we allow the Go version that is set up to be
configurable and not dependent on a specific environment variable. This
will allow us to eventually extract the action into a tooling
repository.

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

@@ -1,14 +1,18 @@
-# A resuable workflow that's used to setup the go enviroment and cache.
-name: Setup go enviroment
+name: "Setup Golang environment"
+description: "A reusable workflow that's used to set up the Go environment and cache."
+inputs:
+  go-version:
+    description: "The version of Golang to set up"
+    required: true
 
 runs:
   using: "composite"
 
   steps:
-    - name: setup go ${{ env.GO_VERSION }}
+    - name: setup go ${{ inputs.go-version }}
       uses: actions/setup-go@v3
       with:
-        go-version: '${{ env.GO_VERSION }}'
+        go-version: '${{ inputs.go-version }}'
 
     - name: go cache
       uses: actions/cache@v3
@@ -23,9 +27,9 @@ runs:
           ~/.cache/go-build
           ~/Library/Caches/go-build
           ~\AppData\Local\go-build
-        key: ${{ runner.os }}-go-${{ env.GO_VERSION }}-${{ hashFiles('**/go.sum') }}
+        key: ${{ runner.os }}-go-${{ inputs.go-version }}-${{ hashFiles('**/go.sum') }}
         restore-keys: |
-          ${{ runner.os }}-go-${{ env.GO_VERSION }}-
+          ${{ runner.os }}-go-${{ inputs.go-version }}-
 
     - name: set GOPATH
       shell: bash