Workflows
Composite action
Quick answer
A composite action bundles several workflow steps into a single reusable action defined in YAML, without needing JavaScript or a container.
A composite action bundles several workflow steps into a single reusable action defined in YAML, without needing JavaScript or a container.
Why it matters
Composite actions are the cheapest way to stop copying the same six setup steps into thirty workflows. They cannot set up a job's runs-on, only its steps.
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Related
Artifact retentionArtifact retention is the period GitHub keeps workflow artifacts before deleting them, defaulting to 90 days and configurable per repository or per upload.Build matrixA build matrix is a GitHub Actions feature that expands one job definition into many parallel jobs across combinations of variables such as OS and language version.Concurrency groupA concurrency group is a named lock that limits how many workflow runs matching that name can be in progress at once.Container jobA container job runs all of a job's steps inside a specified container image rather than directly on the runner.