build-and-publish.yml

name: Build and Publish

on:
  # run it on push to the default repository branch
  push:
    branches: [master, develop, umee]
  # run it during pull request
  pull_request:
  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs: 
  docker:
    name: Build Docker image and push to repositories
    # run only when code is compiling and tests are passing
    runs-on: ubuntu-latest

    # steps to perform in job
    steps:
      - name: Checkout code
        uses: actions/checkout@v2

      # setup Docker buld action
      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v1

      - name: Login to Github Packages
        uses: docker/login-action@v1
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GHCR_PAT }}
      
      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v2
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      - name: Build image and push to GitHub Container Registry
        uses: docker/build-push-action@v2
        with:
          # Note: tags has to be all lower-case
          tags: ${{ steps.meta.outputs.tags }}
          # build on feature branches, push only on master
          push: true

      - name: Image digest
        run: echo ${{ steps.docker_build.outputs.digest }}