PR Title workflow (mvanhorn/cli-printing-press)

The PR Title workflow from mvanhorn/cli-printing-press, explained and optimized by Latchkey.

What it does

This is the PR Title workflow from the mvanhorn/cli-printing-press 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

name: PR Title

on:
  pull_request:
    types: [opened, edited, synchronize, reopened]

permissions:
  pull-requests: read

jobs:
  lint:
    name: pr-title
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - name: Skip Mergify merge queue batches
        if: startsWith(github.event.pull_request.title, 'merge queue:')
        run: echo "Skipping semantic title check for Mergify merge queue batch."

      - uses: amannn/action-semantic-pull-request@v6
        if: ${{ !startsWith(github.event.pull_request.title, 'merge queue:') }}
        with:
          types: |
            feat
            fix
            docs
            chore
            refactor
            test
            ci
            perf
            build
            style
            revert
          requireScope: true
          subjectPattern: ^.+$
          subjectPatternError: "PR title must have a description after the colon"
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

The same workflow, on Latchkey

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

name: PR Title
 
on:
  pull_request:
    types: [opened, edited, synchronize, reopened]
 
permissions:
  pull-requests: read
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  lint:
    name: pr-title
    runs-on: latchkey-small
    timeout-minutes: 5
    steps:
      - name: Skip Mergify merge queue batches
        if: startsWith(github.event.pull_request.title, 'merge queue:')
        run: echo "Skipping semantic title check for Mergify merge queue batch."
 
      - uses: amannn/action-semantic-pull-request@v6
        if: ${{ !startsWith(github.event.pull_request.title, 'merge queue:') }}
        with:
          types: |
            feat
            fix
            docs
            chore
            refactor
            test
            ci
            perf
            build
            style
            revert
          requireScope: true
          subjectPattern: ^.+$
          subjectPatternError: "PR title must have a description after the colon"
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 

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.
• Cancel superseded runs when a branch or PR gets a newer push.

1 third-party action is referenced by a movable tag. Pin it to the commit SHA (Latchkey resolves and applies this automatically) so a repointed tag cannot change what runs.

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