Conflict detector workflow (fastapi/asyncer)

The Conflict detector workflow from fastapi/asyncer, explained and optimized by Latchkey.

CI health: C - fair

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Source: fastapi/asyncer.github/workflows/detect-conflicts.ymlLicense MITView source

What it does

This is the Conflict detector workflow from the fastapi/asyncer 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: "Conflict detector"
on:
  push:
  pull_request_target: # zizmor: ignore[dangerous-triggers]
    types: [synchronize]

permissions: {}

jobs:
  main:
    permissions:
      contents: read
      pull-requests: write
    runs-on: ubuntu-latest
    steps:
      - name: Check if PRs have merge conflicts
        uses: eps1lon/actions-label-merge-conflict@0273be72a0bbd58fcd71d0d6c02c209b50d1e5e1 # v3.1.0
        with:
          dirtyLabel: "conflicts"
          repoToken: "${{ secrets.GITHUB_TOKEN }}"
          commentOnDirty: "This pull request has a merge conflict that needs to be resolved."

The same workflow, on Latchkey

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

name: "Conflict detector"
on:
  push:
  pull_request_target: # zizmor: ignore[dangerous-triggers]
    types: [synchronize]
 
permissions: {}
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  main:
    timeout-minutes: 30
    permissions:
      contents: read
      pull-requests: write
    runs-on: latchkey-small
    steps:
      - name: Check if PRs have merge conflicts
        uses: eps1lon/actions-label-merge-conflict@0273be72a0bbd58fcd71d0d6c02c209b50d1e5e1 # v3.1.0
        with:
          dirtyLabel: "conflicts"
          repoToken: "${{ secrets.GITHUB_TOKEN }}"
          commentOnDirty: "This pull request has a merge conflict that needs to be resolved."

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Cancel superseded runs when a branch or PR gets a newer push.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