Labeler workflow (ljagiello/ctf-skills)

The Labeler workflow from ljagiello/ctf-skills, explained and optimized by Latchkey.

What it does

This is the Labeler workflow from the ljagiello/ctf-skills 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: Labeler

'on':
  pull_request_target:
    types: [opened, synchronize, reopened]

permissions:
  contents: read
  pull-requests: write

concurrency:
  group: labeler-${{ github.event.pull_request.number }}
  cancel-in-progress: true

jobs:
  label:
    name: Auto-label PR
    runs-on: ubuntu-latest
    steps:
      - name: Label PR based on changed files
        uses: actions/labeler@v6
        with:
          configuration-path: .github/labeler.yml
          sync-labels: false

The same workflow, on Latchkey

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

---
name: Labeler
 
'on':
  pull_request_target:
    types: [opened, synchronize, reopened]
 
permissions:
  contents: read
  pull-requests: write
 
concurrency:
  group: labeler-${{ github.event.pull_request.number }}
  cancel-in-progress: true
 
jobs:
  label:
    timeout-minutes: 30
    name: Auto-label PR
    runs-on: latchkey-small
    steps:
      - name: Label PR based on changed files
        uses: actions/labeler@v6
        with:
          configuration-path: .github/labeler.yml
          sync-labels: false
 

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.

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