Devcontainer Shellcheck workflow (rails/rails)

The Devcontainer Shellcheck workflow from rails/rails, explained and optimized by Latchkey.

CI health: C - fair

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

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Source: rails/rails.github/workflows/devcontainer-shellcheck.ymlLicense MITView source

What it does

This is the Devcontainer Shellcheck workflow from the rails/rails 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: Devcontainer Shellcheck

on:
  pull_request:
    paths:
      - ".devcontainer/**/*.sh"
  push:
    paths:
      - ".devcontainer/**/*.sh"

permissions:
  contents: read

jobs:
  devcontainer_shellcheck:
    name: Devcontainer Shellcheck
    runs-on: ubuntu-latest
    steps:
      - name: Checkout (GitHub)
        uses: actions/checkout@v7

      - name: Lint Devcontainer Scripts
        run: |
          find .devcontainer/ -name '*.sh' -print0 | xargs -0 shellcheck

The same workflow, on Latchkey

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

name: Devcontainer Shellcheck
 
on:
  pull_request:
    paths:
      - ".devcontainer/**/*.sh"
  push:
    paths:
      - ".devcontainer/**/*.sh"
 
permissions:
  contents: read
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  devcontainer_shellcheck:
    timeout-minutes: 30
    name: Devcontainer Shellcheck
    runs-on: latchkey-small
    steps:
      - name: Checkout (GitHub)
        uses: actions/checkout@v7
 
      - name: Lint Devcontainer Scripts
        run: |
          find .devcontainer/ -name '*.sh' -print0 | xargs -0 shellcheck

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Cancel superseded runs when a branch or PR gets a newer push.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

Actions used in this workflow

actions/checkout