build-and-stage.yml

name: build-website
on:
  pull_request:
    branches:
    - main
  push:
    branches:
    - main

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

permissions:
  contents: 'read'
  pull-requests: 'write'

env:
  DOCFX_VERSION: 2.59.4
  DOCFX_SOURCE_BRANCH_NAME: ${{ github.base_ref || github.ref_name }}
  STEELTOE_V2_VERSION: 2.5.5
  STEELTOE_V3_VERSION: 3.2.6
  SITE_IMAGE_VERSION: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) || github.run_id }}

jobs:
  change-detection:
    name: Detect which layers need to be built, set image versions
    runs-on: ubuntu-latest
    # Set job outputs to values from filter step
    outputs:
      docfx-layer-changed: ${{ steps.filter.outputs.docfx-layer-changed }}
      docfx-image-version: ${{ steps.version.outputs.docfx-image-version }}
      metadata-layer-changed: ${{ steps.filter.outputs.metadata-layer-changed }}
      metadata-image-version: ${{ steps.version.outputs.metadata-image-version }}
    steps:
    - name: Checkout
      uses: actions/checkout@v4

    - uses: dorny/paths-filter@v3
      id: filter
      with:
        filters: |
          docfx-layer-changed:
            - .github/workflows/build-and-stage.yml
            - 'docfx/**'
          metadata-layer-changed:
            - .github/workflows/build-and-stage.yml
            - Dockerfile-metadata
            - '/api-*.*'
            - build-metadata.sh
            - docfx.json
    - name: Declare image versions
      id: version
      run: |
        if '${{ steps.filter.outputs.docfx-layer-changed }}' == 'true'
        then
          echo "docfx-image-version=${{ github.event_name == 'pull_request' && github.run_id || env.DOCFX_VERSION }}" >> "$GITHUB_OUTPUT"
        else
          echo "docfx-image-version=${{ env.DOCFX_VERSION }}" >> "$GITHUB_OUTPUT"
        fi
        if '${{ steps.filter.outputs.metadata-layer-changed }}' == 'true'
        then
          echo "metadata-image-version=${{ github.event_name == 'pull_request' && github.run_id || env.STEELTOE_VERSIONS }}" >> "$GITHUB_OUTPUT"
        else
          echo "metadata-image-version=${{ env.STEELTOE_VERSIONS }}" >> "$GITHUB_OUTPUT"
        fi
      env:
        STEELTOE_VERSIONS: ${{ env.STEELTOE_V2_VERSION }}-${{ env.STEELTOE_V3_VERSION }}
      shell: bash

  build-push-docfx:
    name: Build and push docfx layer
    needs: change-detection
    if: ${{ needs.change-detection.outputs.docfx-layer-changed }}
    runs-on: ubuntu-latest
    steps:
    - name: Checkout
      uses: actions/checkout@v4

    - name: Set DocFX version to use
      run: echo v${{ env.DOCFX_VERSION }} > docfx/version
      shell: bash

    - name: Login to container registry
      uses: docker/login-action@v3
      with:
        registry: "${{ vars.DOCKER_REGISTRY }}"
        username: "${{ secrets.DOCKER_USERNAME }}"
        password: "${{ secrets.DOCKER_PASSWORD }}"

    - name: Build image
      run: docker build docfx --file "docfx/Dockerfile" -t ${{ vars.DOCKER_REGISTRY }}/docfx:${{ needs.change-detection.outputs.docfx-image-version }}

    - name: Push image
      run: docker push ${{ vars.DOCKER_REGISTRY }}/docfx --all-tags

  build-push-metadata:
    name: Build and push API docs layer
    needs: [ change-detection, build-push-docfx ]
    if: ${{ needs.change-detection.outputs.metadata-layer-changed }}
    runs-on: ubuntu-latest
    steps:
    - name: Checkout
      uses: actions/checkout@v4

    - name: Set Steeltoe versions to use
      run: |-
        echo '2:'${{ env.STEELTOE_V2_VERSION }} > metadata.conf
        echo '3:'${{ env.STEELTOE_V3_VERSION }} >> metadata.conf
      shell: bash

    - name: Login to container registry
      uses: docker/login-action@v3
      with:
        registry: "${{ vars.DOCKER_REGISTRY }}"
        username: "${{ secrets.DOCKER_USERNAME }}"
        password: "${{ secrets.DOCKER_PASSWORD }}"

    - name: Build image
      run: docker build --build-arg="DOCFX_IMAGE_VERSION=${{ needs.change-detection.outputs.docfx-image-version }}" . --file "Dockerfile-metadata" -t ${{ vars.DOCKER_REGISTRY }}/documentation-metadata:${{ needs.change-detection.outputs.metadata-image-version }}

    - name: Push image
      run: docker push ${{ vars.DOCKER_REGISTRY }}/documentation-metadata --all-tags

  build-push-deploy:
    name: Build and push documentation image
    needs: [ change-detection, build-push-docfx, build-push-metadata ]
    environment:
      name: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) || vars.STAGING_SLOT_NAME }}
      url: ${{ steps.deploy-to-webapp.outputs.webapp-url }}
    env:
      SLOT_NAME: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) || vars.STAGING_SLOT_NAME }}
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4

    - name: Login to Azure
      uses: azure/login@v1
      with:
        creds: ${{ secrets.AZURE_CREDENTIALS }}

    - name: Login to container registry
      uses: azure/docker-login@v1
      with:
        login-server: "${{ vars.DOCKER_REGISTRY }}"
        username: "${{ secrets.DOCKER_USERNAME }}"
        password: "${{ secrets.DOCKER_PASSWORD }}"

    - name: Build image
      run: docker build --build-arg="METADATA_IMAGE_VERSION=${{ needs.change-detection.outputs.metadata-image-version }}" . --file "Dockerfile" -t ${{ vars.DOCKER_REGISTRY }}/documentation:${{ env.SITE_IMAGE_VERSION }}

    - name: Push image
      run: docker push ${{ vars.DOCKER_REGISTRY }}/documentation --all-tags

    - name: If PR, create a new staging slot
      if: ${{ github.event_name == 'pull_request' }}
      run: az webapp deployment slot create --resource-group ${{ vars.AZURE_RESOURCE_GROUP }} --name ${{ vars.AZURE_WEBAPP_NAME}} --slot ${{ env.SLOT_NAME }} --configuration-source ${{ vars.STAGING_SLOT_NAME }}

      # Need to pair a PR slot with a custom MainSite address?
      # az webapp config appsettings set -g steeltoe --name docs-steeltoe --slot pr-310 --settings mainsite_host=https://www-steeltoe-pr-141.azurewebsites.net

    - name: Deploy to staging slot
      uses: azure/webapps-deploy@v3
      id: deploy-to-webapp
      with:
        app-name: ${{ vars.AZURE_WEBAPP_NAME }}
        images: ${{ vars.DOCKER_REGISTRY }}/documentation:${{ env.SITE_IMAGE_VERSION }}
        slot-name:  ${{ env.SLOT_NAME }}

    - name: If PR, comment with the preview link
      if: ${{ github.event_name == 'pull_request' }}
      uses: mshick/add-pr-comment@v2
      with:
        message: |
          ## Preview link: https://${{ vars.AZURE_WEBAPP_NAME }}-${{ env.SLOT_NAME }}.azurewebsites.net

          - Your changes have been deployed to the preview site. The preview site will update as you add more commits to this branch.
          - The preview link is shareable, but will be deleted when the pull request is merged or closed.

          > *This is an automated message.*
        repo-token: ${{ secrets.GITHUB_TOKEN }}