name: Build on tag

permissions:
  packages: write

on:
  push:
    tags:
      - v[0-9]+.[0-9]+.[0-9]+
      - v[0-9]+.[0-9]+.[0-9]+-*

jobs:
  build:
    name: Build image
    runs-on: ubuntu-20.04

    steps:
      - name: Checkout project
        uses: actions/checkout@v2

      - name: Set env variables
        run: |
          echo "TAG=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV
          IMAGE_NAME="${GITHUB_REPOSITORY#*/}"
          echo "IMAGE_NAME=${IMAGE_NAME//docker-/}" >> $GITHUB_ENV

      - name: Login to Docker Hub
        run: echo ${{ secrets.GITHUB_TOKEN }} | docker login ghcr.io -u ${{ github.repository_owner }} --password-stdin

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1
        id: qemu

      - name: Setup Docker buildx action
        uses: docker/setup-buildx-action@v1
        id: buildx

      - name: Run Docker buildx
        run: |
                docker buildx build \
                --platform linux/amd64,linux/arm64 \
                --tag ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME:$BRANCH \
                --output "type=registry" ./