Add an action covering build of kubernetes engine.

.github/workflows/ci.yml

@@ -48,6 +48,28 @@ jobs:
 
     # Run tests
     - run: go test -v -cover -race ./...
+
+  k8s:
+    name: "Verify k8s build"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        # use max/min supported Go versions
+        go-version: ["1.18.x"]
+
+    steps:
+    - name: Setup Go environment
+      id: setup-go
+      uses: actions/setup-go@v3
+      with:
+        go-version: ${{ matrix.go-version }}
+
+    # Checks-out the repository under $GITHUB_WORKSPACE
+    - uses: actions/checkout@v2
+
+    # Run tests
+    - run: go build -tags k8s
 
   build:
     name: "Build Calculator (${{ matrix.target.os }}, ${{ matrix.go-version }})"