ci workflow (karol-broda/snitch)

The ci workflow from karol-broda/snitch, explained and optimized by Latchkey.

CI health: C - fair

Point runs-on at Latchkey and get run de-duplication, job timeouts, SHA-pinned actions, self-healing for flaky steps, and up to 58% lower cost, applied automatically.

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Source: karol-broda/snitch.github/workflows/ci.yamlLicense MITView source

What it does

This is the ci workflow from the karol-broda/snitch 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: ci

on:
  push:
    branches: [master]
  pull_request:
    branches: [master]

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-go@v6
        with:
          go-version: "1.25.0"

      - name: build
        run: go build -v ./...

      - name: test
        run: go test -v ./...

  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-go@v6
        with:
          go-version: "1.25.0"

      - name: lint
        uses: golangci/golangci-lint-action@v8
        with:
          version: v2.5.0

  nix-build:
    strategy:
      matrix:
        os: [ubuntu-latest, macos-14]
    runs-on: ${{ matrix.os }}
    steps:
      - uses: actions/checkout@v4

      - uses: DeterminateSystems/nix-installer-action@v17

      - uses: nix-community/cache-nix-action@v6
        with:
          primary-key: nix-${{ runner.os }}-${{ hashFiles('flake.lock') }}
          restore-prefixes-first-match: nix-${{ runner.os }}-

      - name: nix flake check
        run: nix flake check

      - name: nix build
        run: nix build

The same workflow, on Latchkey

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

name: ci
 
on:
  push:
    branches: [master]
  pull_request:
    branches: [master]
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build:
    timeout-minutes: 30
    runs-on: latchkey-small
    steps:
      - uses: actions/checkout@v4
 
      - uses: actions/setup-go@v6
        with:
          go-version: "1.25.0"
 
      - name: build
        run: go build -v ./...
 
      - name: test
        run: go test -v ./...
 
  lint:
    timeout-minutes: 30
    runs-on: latchkey-small
    steps:
      - uses: actions/checkout@v4
 
      - uses: actions/setup-go@v6
        with:
          go-version: "1.25.0"
 
      - name: lint
        uses: golangci/golangci-lint-action@v8
        with:
          version: v2.5.0
 
  nix-build:
    timeout-minutes: 30
    strategy:
      matrix:
        os: [ubuntu-latest, macos-14]
    runs-on: ${{ matrix.os }}
    steps:
      - uses: actions/checkout@v4
 
      - uses: DeterminateSystems/nix-installer-action@v17
 
      - uses: nix-community/cache-nix-action@v6
        with:
          primary-key: nix-${{ runner.os }}-${{ hashFiles('flake.lock') }}
          restore-prefixes-first-match: nix-${{ runner.os }}-
 
      - name: nix flake check
        run: nix flake check
 
      - name: nix build
        run: nix build

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.

3 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.

This workflow runs 3 jobs (4 with the matrix expanded) per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow

actions/checkout actions/setup-go golangci/golangci-lint-action