name: "Build and publish image"
on:
  push:
    branches: ["master"]

jobs:
  build:
    runs-on: "ubuntu-latest"
    steps:
      - name: "Checkout repository"
        uses: "actions/checkout@v2"
      - name: "Login with Github packages"
        uses: "docker/login-action@v1"
        with:
          registry: "ghcr.io"
          username: "${{ github.repository_owner }}"
          password: "${{ secrets.GITHUB_TOKEN }}"
      - name: "Set up buildx"
        uses: "docker/setup-buildx-action@v1"
      - name: "Extract branch name"
        shell: "bash"
        run: "echo \"##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})\""
        id: "extract_branch"
      - name: "Build and push image"
        uses: "docker/build-push-action@v2"
        with:
          context: "./"
          file: "./Dockerfile"
          push: true
          tags: "ghcr.io/${{ github.repository_owner }}/iot-weather:${{ steps.extract_branch.outputs.branch }}"