gc.yaml

# 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. Ensure that your repository contains the necessary configuration for your Google Kubernetes Engine cluster, including deployment.yml, kustomization.yml, service.yml, etc.
#
# 2. Create and configure a Workload Identity Provider for GitHub (https://github.com/google-github-actions/auth#setting-up-workload-identity-federation)
#
# 3. Change the values for the GAR_LOCATION, GKE_ZONE, GKE_CLUSTER, IMAGE, REPOSITORY and DEPLOYMENT_NAME environment variables (below).
#
# For more support on how to run the workflow, please visit https://github.com/google-github-actions/setup-gcloud/tree/master/example-workflows/gke-kustomize

# TUTORIAL: https://docs.github.com/en/actions/use-cases-and-examples/deploying/deploying-to-google-kubernetes-engine

name: Build and Deploy to GKE

on:
  push:
    branches: [ "main" ]

env:
  PROJECT_ID: ${{ secrets.GKE_PROJECT }}
  # GAR_LOCATION: us-central1 # TODO: update region of the Artifact Registry
  GAR_LOCATION: ${{ secrets.GKE_GAR_LOCATION }}
  # GKE_CLUSTER: cluster-1    # TODO: update to cluster name
  GKE_CLUSTER: my-cluster    # TODO: update to cluster name
  # GKE_ZONE: us-central1-c   # TODO: update to cluster zone
  GKE_ZONE: ${{ secrets.GKE_ZONE }}   # TODO: update to cluster zone
  # DEPLOYMENT_NAME: gke-test # TODO: update to deployment name
  DEPLOYMENT_NAME: gke-deployment # TODO: update to deployment name
  # REPOSITORY: samples # TODO: update to Artifact Registry docker repository
  REPOSITORY: kubernetes-ci-cd-github-actions # TODO: update to Artifact Registry docker repository
  # IMAGE: static-site
  IMAGE: kubernetes-ci-cd-github-actions

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@v4

    # Configure Workload Identity Federation and generate an access token.
    # - id: 'auth'
    #   name: 'Authenticate to Google Cloud'
    #   uses: 'google-github-actions/auth@v0'
    #   with:
    #     token_format: 'access_token'
    #     workload_identity_provider: 'projects/123456789/locations/global/workloadIdentityPools/my-pool/providers/my-provider'
    #     service_account: 'my-service-account@my-project.iam.gserviceaccount.com'

    # Alternative option - authentication via credentials json
    - name: Google Cloud auth
      id: 'auth'
      uses: 'google-github-actions/auth@v2'
      with:
        credentials_json: '${{ secrets.GCP_CREDENTIALS }}'

    - name: 'Set up Cloud SDK'
      uses: 'google-github-actions/setup-gcloud@v1'
      with:
        project_id: '${{ env.GKE_PROJECT }}'

    - name: 'Docker auth'
      run: |-
        gcloud auth configure-docker ${{ env.GAR_LOCATION }}-docker.pkg.dev

    # - name: Docker configuration
    #   run: |-
    #     echo ${{steps.auth.outputs.access_token}} | docker login -u oauth2accesstoken --password-stdin https://$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@v0
    #   with:
    #     cluster_name: ${{ env.GKE_CLUSTER }}
    #     location: ${{ env.GKE_ZONE }}

    # Build the Docker image
    - name: Build
      run: |-
        docker build \
          --tag "$GAR_LOCATION-docker.pkg.dev/$PROJECT_ID/$REPOSITORY/$IMAGE:$GITHUB_SHA" \
          --build-arg GITHUB_SHA="$GITHUB_SHA" \
          --build-arg GITHUB_REF="$GITHUB_REF" \
          .

    # Push the Docker image to Google Artifact Registry
    - name: Publish
      run: |-
        docker push "$GAR_LOCATION-docker.pkg.dev/$PROJECT_ID/$REPOSITORY/$IMAGE:$GITHUB_SHA"

    # Set up kustomize
    - name: Set up Kustomize
      run: |-
        # Enter to the k8s directory (because kustomize cannot get the correct path)
        cd ./k8s

        # Download kustomize
        curl -sfLo ./kustomize https://github.com/kubernetes-sigs/kustomize/releases/download/v3.1.0/kustomize_3.1.0_linux_amd64
        chmod u+x ./kustomize

    # Deploy the Docker image to the GKE cluster
    - name: Deploy to GKE
      run: |-
        # Enter to the k8s directory (because kustomize cannot get the correct path)
        cd ./k8s

        # Replace the image name in the k8s template
        ./kustomize edit set image $GAR_LOCATION-docker.pkg.dev/$PROJECT_ID/$REPOSITORY/$IMAGE:TAG=$GAR_LOCATION-docker.pkg.dev/$PROJECT_ID/$REPOSITORY/$IMAGE:$GITHUB_SHA

        # Build and apply the kustomization
        ./kustomize build | kubectl apply -f -

        # Check the rollout status
        kubectl rollout status deployment/$DEPLOYMENT_NAME

        # Get services information
        kubectl get services -o wide