Workflows
How do I write a composite action?
Quick answer
Create action.yml with runs.using: composite and a steps list.
The detail that matters
Good for bundling setup steps. It cannot change the job's runner — only a reusable workflow can.
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Related
How many jobs can a matrix fan out to?GitHub caps a single matrix at 256 jobs per workflow run.How do I reproduce a CI failure locally?Match the runner image, then SSH into a live runner if the failure only appears in CI.Can I SSH into a runner?Yes. runnerhut supports opening a debug session on a running job with an authorised SSH key.Can I mix GitHub-hosted and managed runners?Yes. runs-on is per job, so different jobs in one workflow can use different providers.