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Publish Docker Image workflow (tsukumijima/KonomiTV)

The Publish Docker Image workflow from tsukumijima/KonomiTV, explained and optimized by Latchkey.

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Source: tsukumijima/KonomiTV.github/workflows/publish_docker_image.yamlLicense MITView source

What it does

This is the Publish Docker Image workflow from the tsukumijima/KonomiTV repository, a real project running GitHub Actions. It is shown here with attribution under its MIT license.

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

The workflow

workflow (.yml)

name: Publish Docker Image

# master ブランチに変更があったとき or タグが作成されたとき or 手動実行
on:
  push:
    branches:
      - master
    tags:
      - '*'
  workflow_dispatch:

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

# ジョブの定義
jobs:
  build-and-push-image:
    runs-on: ubuntu-latest
    # 最新コミットがリリースコミットのときは、タグの push がトリガーのとき以外は実行しない
    ## タグが push された後でないと Releases からサードパーティーライブラリをダウンロードできず失敗する
    if: (startsWith(github.ref, 'refs/tags/v')) || (contains(github.event.head_commit.message, 'Release:') == false)
    permissions:
      contents: read
      packages: write
    steps:

      - name: Checkout Repository
        uses: actions/checkout@v4

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

      # タグの push がトリガーのときだけ、Release のサードパーティーライブラリが確実にアップロードされるまで1分ほど待つ
      - name: Wait for Release to be Created
        if: startsWith(github.ref, 'refs/tags/v')
        run: |
          sleep 60s

      # GitHub Container Registry (ghcr.io) にログイン
      - name: Login to the Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Docker イメージのタグ付け用のメタデータを抽出
      - name: Extract Metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=raw,value=latest,enable={{is_default_branch}}
            type=ref,event=tag

      # Docker イメージをビルドして公開
      - name: Build and Push Docker Image
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          provenance: false

      # おそらく使われることのない、Untagged なイメージをすべて削除する
      # ref: https://github.com/vlaurin/action-ghcr-prune
      - name: Prune Untagged Docker Images
        uses: vlaurin/action-ghcr-prune@v0.6.0
        with:
          token: ${{ secrets.DELETE_GHCR_IMAGES_TOKEN }}
          container: konomitv
          dry-run: false
          prune-untagged: true

The same workflow, on Latchkey

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

 
name: Publish Docker Image
 
# master ブランチに変更があったとき or タグが作成されたとき or 手動実行
on:
  push:
    branches:
      - master
    tags:
      - '*'
  workflow_dispatch:
 
env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}
 
# ジョブの定義
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build-and-push-image:
    timeout-minutes: 30
    runs-on: latchkey-small
    # 最新コミットがリリースコミットのときは、タグの push がトリガーのとき以外は実行しない
    ## タグが push された後でないと Releases からサードパーティーライブラリをダウンロードできず失敗する
    if: (startsWith(github.ref, 'refs/tags/v')) || (contains(github.event.head_commit.message, 'Release:') == false)
    permissions:
      contents: read
      packages: write
    steps:
 
      - name: Checkout Repository
        uses: actions/checkout@v4
 
      - name: Setup Docker Buildx
        uses: docker/setup-buildx-action@v3
 
      # タグの push がトリガーのときだけ、Release のサードパーティーライブラリが確実にアップロードされるまで1分ほど待つ
      - name: Wait for Release to be Created
        if: startsWith(github.ref, 'refs/tags/v')
        run: |
          sleep 60s
 
      # GitHub Container Registry (ghcr.io) にログイン
      - name: Login to the Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
 
      # Docker イメージのタグ付け用のメタデータを抽出
      - name: Extract Metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=raw,value=latest,enable={{is_default_branch}}
            type=ref,event=tag
 
      # Docker イメージをビルドして公開
      - name: Build and Push Docker Image
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          provenance: false
 
      # おそらく使われることのない、Untagged なイメージをすべて削除する
      # ref: https://github.com/vlaurin/action-ghcr-prune
      - name: Prune Untagged Docker Images
        uses: vlaurin/action-ghcr-prune@v0.6.0
        with:
          token: ${{ secrets.DELETE_GHCR_IMAGES_TOKEN }}
          container: konomitv
          dry-run: false
          prune-untagged: true
 

What changed

5 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:

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