Github Action to Build a Docker Image and push it to Github Packages

build-and-push.yml

# Have a ./Dockerfile in your projecft and put in .github/workflows/build-and-push.yml
name: Build Docker Image and Push to Github Packages

on:
  push:
    tags:
    - '*'

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v1
      - name: Build and Push Image to Github Packages
        env:
          DOCKER_USERNAME: ${{ github.actor }}
          DOCKER_PASSWORD: ${{ secrets.GITHUB_TOKEN }}
          REPOSITORY: ${{ github.repository }}
          REF: ${{ github.ref }}
          REGISTRY: docker.pkg.github.com
          IMAGE_NAME: app
        run: |
          TAG=${REF##*/}
          echo "$DOCKER_PASSWORD" | docker login docker.pkg.github.com -u "$DOCKER_USERNAME" --password-stdin
          docker build -t $REGISTRY/$REPOSITORY/$IMAGE_NAME:$TAG .
          docker push $REGISTRY/$REPOSITORY/$IMAGE_NAME:$TAG
          echo "::set-output name=image::$REGISTRY/$REPOSITORY/$IMAGE_NAME:$TAG"