name: Docker build on tag
env:
  DOCKER_CLI_EXPERIMENTAL: enabled
  TAG_FMT: "^refs/tags/(((.?[0-9]+){3,4}))$"
on:
  push:
    tags:
      - v[0-9]+.[0-9]+.[0-9]+
      - v[0-9]+.[0-9]+.[0-9]+-*
jobs:
  build:
    runs-on: self-hosted
    steps:
      - name: Set env variables
        run: echo "TAG=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV
      - uses: actions/checkout@v2
      - uses: actions/cache@v2
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-
      - uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - uses: docker/setup-qemu-action@v1
      - uses: docker/setup-buildx-action@v1
      - name: Build the Docker image
        run: |
          docker buildx build \
            -t ghcr.io/${{ github.repository_owner }}/snort:$TAG \
            --cache-from "type=local,src=/tmp/.buildx-cache" \
            --cache-to "type=local,dest=/tmp/.buildx-cache" \
            --platform linux/amd64,linux/arm64 \
            --push .