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Docker workflow (willnorris/imageproxy)

The Docker workflow from willnorris/imageproxy, explained and optimized by Latchkey.

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Source: willnorris/imageproxy.github/workflows/docker.ymlLicense Apache-2.0View source

What it does

This is the Docker workflow from the willnorris/imageproxy repository, a real project running GitHub Actions. It is shown here with attribution under its Apache-2.0 license.

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

The workflow

workflow (.yml)
name: Docker

on:
  push:
    branches: ["main"]
    tags: ["v*"]
  pull_request:
    # Run the workflow on pull_request events to ensure we can still build the image.
    # We only publish the image on push events (see if statements in steps below).
    branches: ["main"]

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      id-token: write

    steps:
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

      - name: Setup Docker buildx
        uses: docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2 # v3.10.0

      - name: Log into registry ${{ env.REGISTRY }}
        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772 # v3.4.0
        if: github.event_name == 'push'
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 # v5.7.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}

      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1 # v6.16.0
        with:
          context: .
          push: ${{ github.event_name == 'push' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          platforms: linux/amd64,linux/arm64

      # Sign the Docker image
      - name: Install cosign
        if: github.event_name == 'push'
        uses: sigstore/cosign-installer@3454372f43399081ed03b604cb2d021dabca52bb #v3.8.2
      - name: Sign the published Docker image
        if: github.event_name == 'push'
        env:
          COSIGN_YES: "true"
        run: cosign sign ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@${{ steps.build-and-push.outputs.digest }}

The same workflow, on Latchkey

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

name: Docker
 
on:
  push:
    branches: ["main"]
    tags: ["v*"]
  pull_request:
    # Run the workflow on pull_request events to ensure we can still build the image.
    # We only publish the image on push events (see if statements in steps below).
    branches: ["main"]
 
env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build-and-push-image:
    timeout-minutes: 30
    runs-on: latchkey-small
    permissions:
      contents: read
      packages: write
      id-token: write
 
    steps:
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
      - name: Setup Docker buildx
        uses: docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2 # v3.10.0
 
      - name: Log into registry ${{ env.REGISTRY }}
        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772 # v3.4.0
        if: github.event_name == 'push'
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
 
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 # v5.7.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
 
      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1 # v6.16.0
        with:
          context: .
          push: ${{ github.event_name == 'push' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          platforms: linux/amd64,linux/arm64
 
      # Sign the Docker image
      - name: Install cosign
        if: github.event_name == 'push'
        uses: sigstore/cosign-installer@3454372f43399081ed03b604cb2d021dabca52bb #v3.8.2
      - name: Sign the published Docker image
        if: github.event_name == 'push'
        env:
          COSIGN_YES: "true"
        run: cosign sign ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@${{ steps.build-and-push.outputs.digest }}

What changed

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:

This workflow runs 1 job 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/setup-buildx-action docker/login-action docker/metadata-action docker/build-push-action