gitops.yml

name: GitOps Implementation
on:
  pull_request:
    branches:
      - master
  push:
    branches:
      - master
  workflow_dispatch:
defaults:
  run:
    working-directory: ./tf-variables/
env:
  TERRAFORM_VER: 1.8.0
  TERRAFORM_DIR: "./tf-variables/"
  CLOUDSDK_VER: 480.0.0
permissions:
  pull-requests: write
jobs:
  infrastructure-deployment:
    name: Infrastructure Deployment
    runs-on: ubuntu-latest
    permissions:
        contents: read
        id-token: write
        pull-requests: write
    steps:
      # Checkout the repository code
      - name: Checkout
        id: checkout_code
        uses: actions/checkout@v2

      # Static code analysis using aqua security's tfsec
      - name: Run tfsec scan
        id: static_code_analysis
        uses: aquasecurity/tfsec-action@v1.0.3
        with:
          path: ./tf-variables/

      # Install the latest version of Google Cloud SDK
      - id: cloud_sdk_installation
        name: Set up Cloud SDK
        uses: google-github-actions/setup-gcloud@v0.3.0
        with:
          version: ${{ env.CLOUDSDK_VER }}

      # Setup the authentication for the Google Cloud using WIF
      - id: gcp_auth
        name: Authenticate to GCP
        uses: google-github-actions/auth@v0.3.1
        with:
          create_credentials_file: 'true'
          workload_identity_provider: ${{ secrets.WORKLOAD_IDENTITY_PROVIDER_ID }}	
          service_account: ${{ secrets.SERVICE_ACCOUNT }}

      # Install the specified version of Terraform CLI
      - id: tf_installation
        name: Terraform Installation
        uses: hashicorp/setup-terraform@v3
        with:
          terraform_version: ${{ env.TERRAFORM_VER }}

      # Checks that Terraform configuration files adhere to a canonical format
      - name: Terraform fmt
        id: tf_fmt
        run: terraform fmt -check
        continue-on-error: true
        
      # Initialize the Terraform working directory
      - name: Terraform Init
        id: tf_init
        run: terraform init
        
      # Validate the terraform configuration files
      - name: Terraform Validate
        id: tf_validate
        run: terraform validate -no-color
        
      # Generates an execution plan for Terraform
      - name: Terraform Plan
        id: tf_plan
        run: terraform plan -no-color
        continue-on-error: true

      # Comments the terraform plan output on pull request
      - id: comment_output
        name: Comment Terraform Plan Output
        uses: actions/github-script@v7
        if: github.event_name == 'pull_request'
        env:
          PLAN: "terraform\n${{ steps.plan.outputs.stdout }}"
        with:
          script: |
            const output = `#### Terraform Format and Style 🖌\`${{ steps.fmt.outcome }}\`
            #### Terraform Initialization ⚙️\`${{ steps.init.outcome }}\`
            #### Terraform Validation 🤖\`${{ steps.validate.outcome }}\`
            <details><summary>Validation Output</summary>
        
            \`\`\`\n
            ${{ steps.validate.outputs.stdout }}
            \`\`\`
        
            </details>
        
            #### Terraform Plan 📖\`${{ steps.plan.outcome }}\`
        
            <details><summary>Show Plan</summary>
        
            \`\`\`\n
            ${process.env.PLAN}
            \`\`\`
        
            </details>
        
            *Pusher: @${{ github.actor }}, Action: \`${{ github.event_name }}\`, Working Directory: \`${{ env.tf_actions_working_dir }}\`, Workflow: \`${{ github.workflow }}\`*`;
        
            github.rest.issues.createComment({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: output
            })

      # Executes the apply operation to deploy the actual infrastructure
      - name: Terraform Apply
        id: tf_apply
        if: github.ref == 'refs/heads/"master"' && github.event_name == 'push'
        run: terraform apply -auto-approve