Add GitHub Actions workflow for GKE deployment

This workflow builds a Docker container, publishes it to Google Container Registry, and deploys it to GKE on pushes to the main branch. It includes steps for authentication, Docker image building, and deployment configuration.

.github/workflows/google.yml

@@ -0,0 +1,116 @@
+# This workflow will build a docker container, publish it to Google Container
+# Registry, and deploy it to GKE when there is a push to the "main"
+# branch.
+#
+# To configure this workflow:
+#
+# 1. Enable the following Google Cloud APIs:
+#
+#    - Artifact Registry (artifactregistry.googleapis.com)
+#    - Google Kubernetes Engine (container.googleapis.com)
+#    - IAM Credentials API (iamcredentials.googleapis.com)
+#
+#    You can learn more about enabling APIs at
+#    https://support.google.com/googleapi/answer/6158841.
+#
+# 2. Ensure that your repository contains the necessary configuration for your
+#    Google Kubernetes Engine cluster, including deployment.yml,
+#    kustomization.yml, service.yml, etc.
+#
+# 3. Create and configure a Workload Identity Provider for GitHub:
+#    https://github.com/google-github-actions/auth#preferred-direct-workload-identity-federation.
+#
+#    Depending on how you authenticate, you will need to grant an IAM principal
+#    permissions on Google Cloud:
+#
+#    - Artifact Registry Administrator (roles/artifactregistry.admin)
+#    - Kubernetes Engine Developer (roles/container.developer)
+#
+#    You can learn more about setting IAM permissions at
+#    https://cloud.google.com/iam/docs/manage-access-other-resources
+#
+# 5. Change the values in the "env" block to match your values.
+
+name: 'Build and Deploy to GKE'
+
+on:
+  push:
+    branches:
+      - '"main"'
+
+env:
+  PROJECT_ID: 'my-project' # TODO: update to your Google Cloud project ID
+  GAR_LOCATION: 'us-central1' # TODO: update to your region
+  GKE_CLUSTER: 'cluster-1' # TODO: update to your cluster name
+  GKE_ZONE: 'us-central1-c' # TODO: update to your cluster zone
+  DEPLOYMENT_NAME: 'gke-test' # TODO: update to your deployment name
+  REPOSITORY: 'samples' # TODO: update to your Artifact Registry docker repository name
+  IMAGE: 'static-site'
+  WORKLOAD_IDENTITY_PROVIDER: 'projects/123456789/locations/global/workloadIdentityPools/my-pool/providers/my-provider' # TODO: update to your workload identity provider
+
+jobs:
+  setup-build-publish-deploy:
+    name: 'Setup, Build, Publish, and Deploy'
+    runs-on: 'ubuntu-latest'
+    environment: 'production'
+
+    permissions:
+      contents: 'read'
+      id-token: 'write'
+
+    steps:
+      - name: 'Checkout'
+        uses: 'actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332' # actions/checkout@v4
+
+      # Configure Workload Identity Federation and generate an access token.
+      #
+      # See https://github.com/google-github-actions/auth for more options,
+      # including authenticating via a JSON credentials file.
+      - id: 'auth'
+        name: 'Authenticate to Google Cloud'
+        uses: 'google-github-actions/auth@f112390a2df9932162083945e46d439060d66ec2' # google-github-actions/auth@v2
+        with:
+          workload_identity_provider: '${{ env.WORKLOAD_IDENTITY_PROVIDER }}'
+
+      # Authenticate Docker to Google Cloud Artifact Registry
+      - name: 'Docker Auth'
+        uses: 'docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567' # docker/login-action@v3
+        with:
+          username: 'oauth2accesstoken'
+          password: '${{ steps.auth.outputs.auth_token }}'
+          registry: '${{ env.GAR_LOCATION }}-docker.pkg.dev'
+
+      # Get the GKE credentials so we can deploy to the cluster
+      - name: 'Set up GKE credentials'
+        uses: 'google-github-actions/get-gke-credentials@6051de21ad50fbb1767bc93c11357a49082ad116' # google-github-actions/get-gke-credentials@v2
+        with:
+          cluster_name: '${{ env.GKE_CLUSTER }}'
+          location: '${{ env.GKE_ZONE }}'
+
+      # Build the Docker image
+      - name: 'Build and push Docker container'
+        run: |-
+          DOCKER_TAG="${GAR_LOCATION}-docker.pkg.dev/${PROJECT_ID}/${REPOSITORY}/${IMAGE}:${GITHUB_SHA}"
+
+          docker build \
+            --tag "${DOCKER_TAG}" \
+            --build-arg GITHUB_SHA="${GITHUB_SHA}" \
+            --build-arg GITHUB_REF="${GITHUB_REF}" \
+            .
+
+          docker push "${DOCKER_TAG}"
+
+      # Set up kustomize
+      - name: 'Set up Kustomize'
+        run: |-
+          curl -sfLo kustomize https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv5.4.3/kustomize_v5.4.3_linux_amd64.tar.gz
+          chmod u+x ./kustomize
+
+      # Deploy the Docker image to the GKE cluster
+      - name: 'Deploy to GKE'
+        run: |-
+          # replacing the image name in the k8s template
+          ./kustomize edit set image LOCATION-docker.pkg.dev/PROJECT_ID/REPOSITORY/IMAGE:TAG=$GAR_LOCATION-docker.pkg.dev/$PROJECT_ID/$REPOSITORY/$IMAGE:$GITHUB_SHA
+          ./kustomize build . | kubectl apply -f -
+          kubectl rollout status deployment/$DEPLOYMENT_NAME
+          kubectl get services -o wide