publish.yml

name: Publish

on:
  push:
    branches:
      - main
    tags:
      - "v20*"

env:
  IMAGE_NAME: asciinema-server

jobs:
  publish:
    runs-on: ubuntu-22.04
    permissions:
      packages: write
      contents: read

    steps:
      - uses: actions/checkout@v4

      - name: Set up outputs
        id: vars
        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 >> $GITHUB_OUTPUT
          echo VERSION=$VERSION >> $GITHUB_OUTPUT

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build image
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ steps.vars.outputs.IMAGE_ID }}:${{ steps.vars.outputs.VERSION }}
          labels: runnumber=${{ github.run_id }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          platforms: linux/amd64,linux/arm64