deploy_aks.yml

name: Build and deploy to AKS cluster

on:
  push:
    branches:
    - master
  pull_request:
    branches:
    - master

concurrency: deploy-${{ github.ref }}

jobs:
  build:
    runs-on: ubuntu-latest
    outputs:
      docker-image-tag: ${{ steps.build-image.outputs.tag }}
      matrix-environments: ${{ toJSON(steps.*.outputs.matrix-environment) }}

    steps:
    - name: Checkout
      uses: actions/checkout@v4

    - name: Setup ruby
      uses: ruby/setup-ruby@v1
      with:
        ruby-version: 2.7
        bundler-cache: true

    - name: Build docs with middleman
      run: make build

    - name: Build and push docker image
      id: build-image
      uses: DFE-Digital/github-actions/build-docker-image@master
      with:
        github-token: ${{ secrets.GITHUB_TOKEN }}
        context: .

    - name: Prepare matrix environments review
      id: matrix-env-review
      if: github.event_name == 'pull_request'
      run: echo "matrix-environment=review" >> $GITHUB_OUTPUT

    - name: Prepare matrix environments for production
      id: matrix-env-main
      if: github.ref == 'refs/heads/main' && github.event_name == 'push'
      run: |
        echo "matrix-environment=production" >> $GITHUB_OUTPUT

  deploy:
        name: Deploy ${{ matrix.environment }}
        runs-on: ubuntu-latest
        needs: [build]
        environment:
          name: ${{ matrix.environment }}
          url: ${{ steps.get-app-url.outputs.url }}
        strategy:
          max-parallel: 1
          matrix:
            environment: ${{ fromJSON(needs.build.outputs.matrix-environments) }}

        steps:
          - name: Checkout code
            uses: actions/checkout@v3

          - uses: hashicorp/setup-terraform@v3
            with:
              terraform_version: 1.6.4
              terraform_wrapper: false

          - uses: DFE-Digital/github-actions/set-arm-environment-variables@master
            with:
              azure-credentials: ${{ secrets.AZURE_CREDENTIALS }}

          - name: Terraform Apply
            run: |
              make ci ${{ matrix.environment }} terraform-apply
            env:
              DOCKER_IMAGE_TAG: ${{ needs.build.outputs.docker-image-tag }}
              PR_NUMBER: ${{ github.event.pull_request.number }}

          - name: Get application URL
            id: get-app-url
            run: |
              url=$(terraform -chdir=terraform/application output -raw url)
              echo "url=${url}" >> $GITHUB_OUTPUT

          - name: Post comment to Pull Request ${{ github.event.number }}
            if: ${{ github.event_name == 'pull_request' }}
            uses: marocchino/sticky-pull-request-comment@v2
            with:
              header: aks
              message: Review app deployed to <${{ steps.get-app-url.outputs.url }}>