Label PRs with conflicts workflow (mdn/dom-examples)

The Label PRs with conflicts workflow from mdn/dom-examples, explained and optimized by Latchkey.

What it does

This is the Label PRs with conflicts workflow from the mdn/dom-examples repository, a real project running GitHub Actions. It is shown here with attribution under its CC0-1.0 license.

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

The workflow

name: "Label PRs with conflicts"

on:
  push:
  pull_request_target:
    branches:
      - main
    types: [synchronize]

permissions:
  # Label pull requests.
  pull-requests: write

jobs:
  label-merge-conflicts:
    uses: mdn/workflows/.github/workflows/pr-rebase-needed.yml@main
    with:
      target-repo: "mdn/dom-examples"
    secrets:
      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

The same workflow, on Latchkey

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

name: "Label PRs with conflicts"
 
on:
  push:
  pull_request_target:
    branches:
      - main
    types: [synchronize]
 
permissions:
  # Label pull requests.
  pull-requests: write
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  label-merge-conflicts:
    timeout-minutes: 30
    uses: mdn/workflows/.github/workflows/pr-rebase-needed.yml@main
    with:
      target-repo: "mdn/dom-examples"
    secrets:
      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 

What changed

• Cancel superseded runs when a branch or PR gets a newer push.
• Add a job timeout so a hung step cannot burn hours of runner time.

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.