build.yaml

name: Build Docker image

on:
  push:
    branches: main
  workflow_dispatch:

env:
  CONTAINER_REGISTRY: ghcr.io

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ${{ env.CONTAINER_REGISTRY }}
          username: ${{ github.repository_owner }}
          password: ${{ github.token }}

      - name: Generate image tag
        id: prepare
        run: |
          branch=${GITHUB_REF##*/}
          sha=${GITHUB_SHA::8}
          ts=$(date +%s)
          echo "TAG=${branch}-${sha}-${ts}" >> $GITHUB_OUTPUT

      - name: Build and publish container image with tag
        uses: docker/build-push-action@v4
        with:
          context: .
          push: true
          tags: |
            ${{ env.CONTAINER_REGISTRY }}/${{ github.repository }}:${{ steps.prepare.outputs.TAG }}
          cache-from: type=gha
          cache-to: type=gha,mode=max