Security
Do runners keep state between jobs?
Quick answer
Ephemeral runners do not. Persistent self-hosted runners do, which is a security risk on public repositories.
The detail that matters
If a runner keeps state, one job can leave something behind for the next one to find.
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Related
Are snapshot runners safe for public repositories?Only if snapshots are taken from trusted branches and never from fork pull requests.How do I generate an SBOM?Enable buildx's sbom: true output, or run syft against the built image.How do I attach build provenance?Use actions/attest-build-provenance, or buildx's provenance: true attestation.How do I pass secrets into a Docker build?Use BuildKit build secrets with --secret, never ARG or ENV.