Tool cheatsheet

GitHub Actions 1 Cheatsheet

Workflow YAML snippets for triggers, jobs, caching, secrets, matrices, artifacts and deployment.

Workflow basics

Minimal workflow — A workflow file in .github/workflows/ that runs tests on every push and pull request.
Run only when certain files change — Limit a trigger to changes under given paths.
Run on a schedule — Run at 03:00 UTC every day. Scheduled times use UTC cron syntax.
Run manually with inputs — Add a Run workflow button with an input.
Set environment variables — Define variables for a workflow, job or step.
Run several commands — Use a block scalar to run a multi-line script in one step.
Set a job timeout — Stop a job that hangs, instead of waiting for the six-hour default.

Set up Node.js with caching — Install a Node.js version and cache npm downloads.
Set up Python with caching — Install Python and cache pip downloads.
Cache files between runs — Cache any folder, keyed by a hash of a lock file.
Upload a build artifact — Save files from a job so you can download them or use them in a later job.
Download an artifact in another job — Fetch an artifact produced earlier in the workflow.

Test across versions — Run the same job once per Node.js version and operating system.
Run jobs in order — Make one job wait for another to succeed.
Run a step conditionally — Run a step only on the main branch.
Run a step after a failure — Run cleanup or notifications when an earlier step failed.
Cancel outdated runs — Cancel an in-progress run when a newer one starts for the same branch.
Start a database for tests — Run a PostgreSQL container next to the job.
Pass data between jobs — Expose a step's output as a job output that later jobs can read.

Use a secret — Read a repository secret. Secrets are masked in logs.
Limit the token's permissions — Give GITHUB_TOKEN only the access the workflow needs.
Require approval for a deployment — Target an environment that has protection rules, such as required reviewers.
Pin an action to a commit — Use a full commit SHA instead of a tag so a retagged action can't change under you.

Define a reusable workflow — Make a workflow callable from other workflows.
Call a reusable workflow — Run a reusable workflow from a job.
Build and push a Docker image — Log in to GitHub Container Registry and push an image tagged with the commit SHA.
Create a release from a tag — Create a GitHub release with generated notes using the preinstalled gh CLI.

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