nitter/.github/workflows/build-docker.yml

name: Docker

on:
  push:
    paths-ignore:
      - "README.md"
    branches:
      - master

env:
  IMAGE: zedeus/nitter

jobs:
  tests:
    uses: ./.github/workflows/run-tests.yml
    secrets: inherit

  # Build each architecture natively (no emulation) and push by digest only.
  # The digests are stitched into a single multi-arch tag by the merge job.
  build:
    needs: [tests]
    strategy:
      fail-fast: false
      matrix:
        include:
          - runner: ubuntu-24.04
            platform: linux/amd64
          - runner: ubuntu-24.04-arm
            platform: linux/arm64
    runs-on: ${{ matrix.runner }}
    steps:
      - name: Prepare platform name
        run: echo "PLATFORM_PAIR=${platform//\//-}" >> "$GITHUB_ENV"
        env:
          platform: ${{ matrix.platform }}

      - uses: actions/checkout@v6

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

      - name: Login to DockerHub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./Dockerfile
          platforms: ${{ matrix.platform }}
          outputs: type=image,name=${{ env.IMAGE }},push-by-digest=true,name-canonical=true,push=true
          # Attestations turn a single-platform push into a manifest index, which
          # breaks push-by-digest + the imagetools merge below. Disable them.
          provenance: false
          sbom: false

      - name: Export digest
        run: |
          mkdir -p "${{ runner.temp }}/digests"
          digest="${{ steps.build.outputs.digest }}"
          touch "${{ runner.temp }}/digests/${digest#sha256:}"

      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ env.PLATFORM_PAIR }}
          path: ${{ runner.temp }}/digests/*
          if-no-files-found: error
          retention-days: 1

  # Combine the per-arch digests into one multi-arch manifest so that
  # `docker pull zedeus/nitter:latest` serves the right image on any CPU.
  merge:
    needs: [build]
    runs-on: ubuntu-24.04
    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: ${{ runner.temp }}/digests
          pattern: digests-*
          merge-multiple: true

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

      - name: Login to DockerHub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Create manifest list and push
        working-directory: ${{ runner.temp }}/digests
        run: |
          # latest-arm64 is a backward-compat alias of the (now multi-arch)
          # latest tag, for users still pinned to the old ARM64-only image.
          # word splitting is intentional: one image ref arg per digest file
          # shellcheck disable=SC2046
          docker buildx imagetools create \
            -t ${{ env.IMAGE }}:latest \
            -t ${{ env.IMAGE }}:latest-arm64 \
            -t ${{ env.IMAGE }}:${{ github.sha }} \
            $(printf '${{ env.IMAGE }}@sha256:%s ' *)

      - name: Inspect image
        run: docker buildx imagetools inspect ${{ env.IMAGE }}:${{ github.sha }}