docker.yml

name: Build and publish Docker image

# Builds the self-host image (deploy/Dockerfile) and pushes it to the GitHub
# Container Registry (ghcr.io/michael-borck/slide-stream). Runs automatically
# when a release lands on main (the version is read from pyproject.toml and
# the build waits for PyPI to serve it), or manually via workflow_dispatch.

on:
  workflow_dispatch:
    inputs:
      version:
        description: "slide-stream version to bake in (blank = read pyproject.toml)"
        required: false
        default: ""
  push:
    branches: [main]
    paths:
      - 'pyproject.toml'
      - 'deploy/Dockerfile'
      - '.github/workflows/docker.yml'

permissions:
  contents: read
  packages: write

env:
  IMAGE: ghcr.io/${{ github.repository }}

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Resolve version
        id: ver
        run: |
          V="${{ inputs.version }}"
          if [ -z "$V" ]; then
            V=$(grep -m1 '^version = ' pyproject.toml | cut -d'"' -f2)
          fi
          echo "version=$V" >> "$GITHUB_OUTPUT"
          echo "Building slide-stream $V"

      - name: Wait for the version on PyPI
        run: |
          V="${{ steps.ver.outputs.version }}"
          for i in $(seq 1 18); do
            if curl -fsS "https://pypi.org/pypi/slide-stream/$V/json" > /dev/null; then
              echo "PyPI has $V"; exit 0
            fi
            echo "PyPI does not have $V yet (attempt $i/18); waiting 10s..."
            sleep 10
          done
          echo "::error::slide-stream $V never appeared on PyPI — publish first (twine), then re-run."
          exit 1

      - uses: docker/setup-buildx-action@v3

      - uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - uses: docker/build-push-action@v6
        with:
          context: deploy
          push: true
          tags: ${{ env.IMAGE }}:latest,${{ env.IMAGE }}:${{ steps.ver.outputs.version }}
          build-args: |
            SLIDE_STREAM_VERSION=${{ steps.ver.outputs.version }}