staging-mailing.yml

# .github/workflows/staging-mailing.yml
name: Compile and push mailing image

# Controls when the workflow will run
on:
  # Triggers the workflow on push or pull request events but only for the master branch
  push:
    branches: ["staging"]

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  # This workflow contains a single job called "build"
  build:
    # The type of runner that the job will run on
    runs-on: ubuntu-latest

    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
      - uses: actions/checkout@v2

      # login with Docker
      - uses: docker/login-action@v1
        name: Login to Docker Hub
        with:
          # generate some credentials from Dockerhub and store them into the repo secrets
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      
      # prepare buildx for docker
      - uses: docker/setup-buildx-action@v1
        name: Set up Docker Buildx

      # build an push the newly created image
      - uses: docker/build-push-action@v2
        name: Build and push
        with:
          context: ./mailing
          file: ./mailing/Dockerfile
          push: true
          tags: ${{ secrets.DOCKERHUB_USERNAME }}/${{ secrets.DOCKERHUB_MAILING_IMAGE_NAME }}:latest