#GitHub Actions GKE build-and-deploy workflow

[Dargon789]

Reviewer's Guide

Adds initial CI/CD infrastructure: a GitHub Actions workflow to build, push, and deploy a Docker image to GKE using Workload Identity Federation and kustomize, and a minimal CircleCI pipeline to validate CI setup.

Flow diagram for GitHub Actions GKE build-and-deploy workflow

flowchart TD
  trigger["Push to branch 'main'"] --> job["Job 'Setup, Build, Publish, and Deploy'"]

  job --> checkout["Step: 'Checkout' source code"]
  checkout --> auth["Step: 'Authenticate to Google Cloud' using Workload Identity Provider"]
  auth --> dockerLogin["Step: 'Docker Auth' to Artifact Registry"]
  dockerLogin --> gkeCreds["Step: 'Set up GKE credentials'"]
  gkeCreds --> buildPush["Step: 'Build and push Docker container' to Artifact Registry"]
  buildPush --> kustomizeSetup["Step: 'Set up Kustomize'"]
  kustomizeSetup --> deploy["Step: 'Deploy to GKE' using Kustomize and kubectl"]
  deploy --> rollout["Result: Updated Kubernetes Deployment 'gke-test' running new image"]

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Flow diagram for CircleCI sample CI pipeline

flowchart TD
  trigger["Code push or pipeline trigger on CircleCI"] --> workflow["Workflow 'say-hello-workflow'"]
  workflow --> job["Job 'say-hello'"]
  job --> dockerExec["Run in Docker image 'cimg/base:current'"]
  dockerExec --> checkout["Step: Checkout repository"]
  checkout --> sayHello["Step: Run command 'echo Hello, World!'"]
  sayHello --> done["Pipeline completes successfully"]

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File-Level Changes

Change	Details	Files
Introduce a GitHub Actions workflow that builds a Docker image, pushes it to Google Artifact Registry, and deploys it to a GKE cluster on pushes to main.	Configure workflow trigger on pushes to the main branch and set environment variables for project, cluster, and image metadata. Authenticate to Google Cloud using google-github-actions/auth with Workload Identity Federation and configure Docker auth against Artifact Registry. Fetch GKE kubeconfig via google-github-actions/get-gke-credentials to enable kubectl-based deployment. Build the Docker image with commit metadata build args, tag it with the GitHub SHA, and push it to Artifact Registry. Download and configure kustomize, update the image reference, apply manifests to the cluster, and verify rollout and service state.	.github/workflows/google.yml
Add a basic CircleCI configuration to validate CI wiring with a sample job and workflow.	Define a simple docker-based job that checks out the repository and runs a hello-world command. Create a workflow that runs the sample job to confirm CircleCI pipeline execution.	.circleci/config.yml

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Originally posted by @sourcery-ai[bot] in #215 (comment)