Core
Runner image
Quick answer
A runner image is the preconfigured disk image containing the operating system and preinstalled toolchain a job starts from.
A runner image is the preconfigured disk image containing the operating system and preinstalled toolchain a job starts from.
Why it matters
GitHub publishes theirs as actions/runner-images. A managed provider that matches it is genuinely drop-in; one that does not will break steps that assume a tool is present.
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Related
GitHub Actions runnerA GitHub Actions runner is the agent process that polls GitHub for queued jobs, executes their steps and streams logs back.Runner labelA runner label is the string in a workflow's runs-on field that determines which runner picks up the job.runs-onruns-on is the GitHub Actions workflow key that specifies which runner or runner label a job should execute on.