build-devcontainer-image.yml

name: Build Devcontainer image
on:
  workflow_dispatch:
    # no content, allows manual triggering

  schedule:
    # 5:30 pm every Sunday (UTC)
    # to pick up any important bug fixes etc in base image
    - cron: '30 17 * * 0'

  push:
    # run when changes pushed to master if any devcontainer files changed
    branches:
    - master
    paths:
    - .devcontainer/**

jobs:
  # Based on: https://docs.github.com/en/actions/guides/publishing-docker-images#publishing-images-to-github-packages
  build-devcontainer-image:
    runs-on: ubuntu-latest

    permissions:
      packages: write
      contents: read

    steps:
      - name: Checkout code
        uses: actions/checkout@v2

      - name: Log in to GitHub Docker Registry
        uses: docker/login-action@v1
        with:
          registry: docker.pkg.github.com # ghcr.io not yet enabled for Azure org
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build & push Devcontainer image 
        uses: docker/build-push-action@v2
        with:
          context: .devcontainer
          push: true
          # Build an image usable as cache-from, per: https://docs.docker.com/engine/reference/commandline/build/#specifying-external-cache-sources
          build-args: BUILDKIT_INLINE_CACHE=1
          tags: |
            docker.pkg.github.com/azure/azure-service-operator/aso-devcontainer:latest
            docker.pkg.github.com/azure/azure-service-operator/aso-devcontainer:${{ github.sha }}