docker-publish.yml

name: Docker

on:
  push:

env:
  IMAGE_NAME: tail-web

concurrency:
  group: "${{ github.workflow }} @ ${{ github.event.pull_request.head.label || github.head_ref || github.ref }}"
  cancel-in-progress: true

jobs:
  push:
    runs-on: ubuntu-latest
    permissions:
      packages: write
      contents: read
    steps:
      - uses: actions/checkout@v2
      - uses: docker/setup-buildx-action@v1

      - name: Generate Image Tag
        id: image-tag
        run: |
          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME

          # Change all uppercase to lowercase
          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')

          # Strip git ref prefix from version
          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')

          # Strip "v" prefix from tag name
          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')

          # Use Docker `latest` tag convention
          [ "$VERSION" == "main" ] && VERSION=latest

          echo IMAGE_ID=$IMAGE_ID
          echo VERSION=$VERSION

          echo "::set-output name=TAG::${IMAGE_ID}:${VERSION}"

      - name: Log into GitHub Container Registry
        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin

      - name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          push: true
          pull: true
          tags: ${{ steps.image-tag.outputs.TAG }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          platforms: linux/amd64