Docker Images workflow (RDFLib/rdflib)

The Docker Images workflow from RDFLib/rdflib, explained and optimized by Latchkey.

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Source: RDFLib/rdflib.github/workflows/docker-images.yamlLicense BSD-3-ClauseView source

What it does

This is the Docker Images workflow from the RDFLib/rdflib repository, a real project running GitHub Actions. It is shown here with attribution under its BSD-3-Clause license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

workflow (.yml)

name: Docker Images

on:
  push:
    branches: ["main"]
  pull_request:
  workflow_dispatch:

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  setup:
    permissions:
      contents: read
    runs-on: ubuntu-latest
    outputs:
      docker-push: ${{ steps.vars.outputs.docker-push }}
      oci-reference: ${{ steps.vars.outputs.oci-reference }}
    steps:
      - id: vars
        run: |
          echo ::set-output name=github-ref::${{ github.ref }}
          echo ::set-output name=docker-push::${{ github.ref == 'refs/heads/main' }}
          echo ::set-output name=oci-reference::ghcr.io/$( echo "${{ github.repository}}" | tr '[:upper:]' '[:lower:]' )
      - id: vars-dump
        run: |
          echo "steps.vars.github-ref = ${{ steps.vars.outputs.github-ref }}"
          echo "steps.vars.docker-push = ${{ steps.vars.outputs.docker-push }}"
          echo "steps.vars.oci-reference = ${{ steps.vars.outputs.oci-reference }}"

  build:
    needs: setup
    permissions:
      contents: read
      packages: read
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
        with:
          fetch-depth: 1
      - name: Install Task
        uses: go-task/setup-task@v2
      - name: Install poetry
        run: |
          pip install -r devtools/requirements-poetry.in
      - name: Build images
        shell: bash
        run: |
          task \
            OCI_REFERENCE="${{ needs.setup.outputs.oci-reference }}" \
            docker:latest docker:unstable
  push:
    if: "${{ needs.setup.outputs.docker-push == 'true' }}"
    needs: [ setup, build ]
    permissions:
      id-token: write
      packages: write
      contents: read
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
        with:
          fetch-depth: 1
      - name: Install Task
        uses: go-task/setup-task@v2
      - name: Install poetry
        run: |
          pip install -r devtools/requirements-poetry.in
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Push images
        shell: bash
        run: |
          task \
            DOCKER_PUSH=true \
            OCI_REFERENCE="${{ needs.setup.outputs.oci-reference }}" \
            docker:latest docker:unstable

The same workflow, on Latchkey

Removes redundant runs and caps runaway jobs. Added and changed lines are highlighted.

name: Docker Images
 
on:
  push:
    branches: ["main"]
  pull_request:
  workflow_dispatch:
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  setup:
    timeout-minutes: 30
    permissions:
      contents: read
    runs-on: latchkey-small
    outputs:
      docker-push: ${{ steps.vars.outputs.docker-push }}
      oci-reference: ${{ steps.vars.outputs.oci-reference }}
    steps:
      - id: vars
        run: |
          echo ::set-output name=github-ref::${{ github.ref }}
          echo ::set-output name=docker-push::${{ github.ref == 'refs/heads/main' }}
          echo ::set-output name=oci-reference::ghcr.io/$( echo "${{ github.repository}}" | tr '[:upper:]' '[:lower:]' )
      - id: vars-dump
        run: |
          echo "steps.vars.github-ref = ${{ steps.vars.outputs.github-ref }}"
          echo "steps.vars.docker-push = ${{ steps.vars.outputs.docker-push }}"
          echo "steps.vars.oci-reference = ${{ steps.vars.outputs.oci-reference }}"
 
  build:
    timeout-minutes: 30
    needs: setup
    permissions:
      contents: read
      packages: read
    runs-on: latchkey-small
    steps:
      - uses: actions/checkout@v7
        with:
          fetch-depth: 1
      - name: Install Task
        uses: go-task/setup-task@v2
      - name: Install poetry
        run: |
          pip install -r devtools/requirements-poetry.in
      - name: Build images
        shell: bash
        run: |
          task \
            OCI_REFERENCE="${{ needs.setup.outputs.oci-reference }}" \
            docker:latest docker:unstable
  push:
    timeout-minutes: 30
    if: "${{ needs.setup.outputs.docker-push == 'true' }}"
    needs: [ setup, build ]
    permissions:
      id-token: write
      packages: write
      contents: read
    runs-on: latchkey-small
    steps:
      - uses: actions/checkout@v7
        with:
          fetch-depth: 1
      - name: Install Task
        uses: go-task/setup-task@v2
      - name: Install poetry
        run: |
          pip install -r devtools/requirements-poetry.in
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Push images
        shell: bash
        run: |
          task \
            DOCKER_PUSH=true \
            OCI_REFERENCE="${{ needs.setup.outputs.oci-reference }}" \
            docker:latest docker:unstable

What changed

Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
Add a job timeout so a hung step cannot burn hours of runner time.

2 third-party actions are referenced by a movable tag. Pin them to the commit SHA (Latchkey resolves and applies this automatically) so a repointed tag cannot change what runs.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

Dependency installs

This workflow runs 3 jobs per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow

actions/checkout docker/login-action