md-to-html/.gitea/workflows/docker.yml

name: Docker

on:
  push:
    branches:
      - main
    tags:
      - "v*"
  workflow_dispatch:

env:
  IMAGE_NAME: fsadmin/md-to-html

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Prepare tags
        id: meta
        shell: sh
        run: |
          set -eu

          if [ -z "${{ vars.REGISTRY }}" ]; then
            echo "::error::Set the REGISTRY repository variable to your Gitea registry host."
            exit 1
          fi

          image="${{ vars.REGISTRY }}/${IMAGE_NAME}"
          short_sha="$(printf '%s' "${GITHUB_SHA}" | cut -c1-12)"

          {
            echo "image=${image}"
            echo "tags<<EOF"
            echo "${image}:${short_sha}"
            if [ "${GITHUB_REF}" = "refs/heads/main" ]; then
              echo "${image}:latest"
            fi
            if [ "${GITHUB_REF_TYPE}" = "tag" ]; then
              echo "${image}:${GITHUB_REF_NAME}"
            fi
            echo "EOF"
          } >> "${GITHUB_OUTPUT}"

      - name: Login to registry
        run: |
          printf '%s' "${{ secrets.REGISTRY_PASSWORD }}" \
            | docker login "${{ vars.REGISTRY }}" \
              --username "${{ secrets.REGISTRY_USERNAME }}" \
              --password-stdin

      - name: Build and push image
        env:
          DOCKER_BUILDKIT: "1"
        run: |
          set -eu

          tags=""
          while IFS= read -r tag; do
            tags="${tags} -t ${tag}"
          done <<'EOF'
          ${{ steps.meta.outputs.tags }}
          EOF

          docker build ${tags} .

          while IFS= read -r tag; do
            docker push "${tag}"
          done <<'EOF'
          ${{ steps.meta.outputs.tags }}
          EOF