build-deploy.yml

name: Build and deploy

on:
  pull_request:
    branches:
    - main
  push:
    branches:
      - main

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

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

env:
  IMAGE_TAG: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) || github.run_id }}

jobs:
  build-push-deploy:
    name: Build and push image
    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 . --file "Dockerfile" -t ${{ vars.DOCKER_REGISTRY }}/initializr-web:${{ env.IMAGE_TAG }}

    - name: Push image
      run: docker push ${{ vars.DOCKER_REGISTRY }}/initializr-web:${{ env.IMAGE_TAG }}

    - 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 staging

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