# build-and-deploy GitHub Actions job to GKE

[Dargon789]

Reviewer's Guide

Adds a new GitHub Actions workflow that builds a Docker image, pushes it to Google Artifact Registry, and deploys it to a GKE cluster on pushes to the master branch using Workload Identity Federation for authentication.

Flow diagram for build-and-deploy GitHub Actions job to GKE

flowchart TD
  A["Push to 'master' branch"] --> B["Trigger workflow 'Build and Deploy to GKE'"]
  B --> C["Start job 'Setup, Build, Publish, and Deploy' on 'ubuntu-latest'"]
  C --> D["Step: Checkout repository (actions/checkout@v4)"]
  D --> E["Step: Authenticate to Google Cloud (google-github-actions/auth@v2) using 'WORKLOAD_IDENTITY_PROVIDER'"]
  E --> F["Output: Short-lived Google Cloud access token (auth_token)"]
  F --> G["Step: Docker Auth (docker/login-action@v3) to '${GAR_LOCATION}-docker.pkg.dev' with 'oauth2accesstoken'"]
  G --> H["Step: Set up GKE credentials (get-gke-credentials@v2) for cluster '${GKE_CLUSTER}' in '${GKE_ZONE}'"]
  H --> I["Step: Build Docker image with 'docker build' using 'GITHUB_SHA' and 'GITHUB_REF'"]
  I --> J["Tag image as '${GAR_LOCATION}-docker.pkg.dev/${PROJECT_ID}/${REPOSITORY}/${IMAGE}:${GITHUB_SHA}'"]
  J --> K["Step: Push Docker image to Artifact Registry with 'docker push'"]
  K --> L["Step: Download and set up 'kustomize' binary"]
  L --> M["Step: Update image in kustomize: 'kustomize edit set image LOCATION-docker.pkg.dev/PROJECT_ID/REPOSITORY/IMAGE:TAG=...:${GITHUB_SHA}'"]
  M --> N["Step: Render manifests with 'kustomize build .' and pipe to 'kubectl apply -f -'"]
  N --> O["Step: Wait for rollout: 'kubectl rollout status deployment/${DEPLOYMENT_NAME}'"]
  O --> P["Step: Inspect services: 'kubectl get services -o wide'"]
  P --> Q["Job completes: Application updated on GKE cluster"]

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File-Level Changes

Change	Details	Files
Introduce a GitHub Actions CI/CD pipeline for building, publishing, and deploying a containerized app to GKE via Artifact Registry.	Define workflow trigger on pushes to the master branch and set environment variables for GCP project, cluster, and Artifact Registry configuration. Configure authentication to Google Cloud using google-github-actions/auth with Workload Identity Federation and set up Docker authentication against Artifact Registry. Retrieve GKE cluster credentials using google-github-actions/get-gke-credentials to enable kubectl access. Build and push a Docker image tagged with the current commit SHA to Artifact Registry using docker build and docker push. Download and prepare kustomize, then use it to update the deployment image, apply manifests to the cluster, wait for rollout, and list services.	.github/workflows/google.yml

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Originally posted by @sourcery-ai[bot] in #87 (comment)