Bump step-security/harden-runner from 2.18.0 to 2.19.1

[dependabot]

Bumps step-security/harden-runner from 2.18.0 to 2.19.1.

Release notes

Sourced from step-security/harden-runner's releases.

v2.19.1

What's Changed

• fix: detect ubuntu-slim runners early and bail out by @​devantler in step-security/harden-runner#657

What the fix changes

• Harden-Runner will detect ubuntu-slim runners and exit cleanly with an informational log message, instead of post harden runner step failing on chown: invalid user: 'undefined'.

What the fix does not do

• Jobs running on ubuntu-slim will not be monitored by Harden-Runner. The agent relies on kernel-level features (that require elevated capabilities).
• Per GitHub's docs on single-CPU runners: "The container for ubuntu-slim runners runs in unprivileged mode. This means that some operations requiring elevated privileges such as mounting file systems, using Docker-in-Docker, or accessing low-level kernel features are not supported." Those low-level kernel features are what the agent needs, so monitoring inside the unprivileged container is not feasible today.

For StepSecurity enterprise customers If your security posture requires that workflows are always monitored, you can block the use of ubuntu-slim via workflow run policies see the Runner Label Policy docs. This lets you enforce that jobs only run on monitored runner types.

New Contributors

• @​devantler made their first contribution in step-security/harden-runner#657

Full Changelog: step-security/harden-runner@v2.19.0...v2.19.1

v2.19.0

What's Changed

New Runner Support

Harden-Runner now supports Depot, Blacksmith, Namespace, and WarpBuild runners with the same egress monitoring, runtime monitoring, and policy enforcement available on GitHub-hosted runners.

Automated Incident Response for Supply Chain Attacks

• Global block list: Outbound connections to known malicious domains and IPs are now blocked even in audit mode.
• System-defined detection rules: Harden-Runner will trigger lockdown mode when a high risk event is detected during an active supply chain attack (for example, a process reading the memory of the runner worker process, a common technique for stealing GitHub Actions secrets).

Bug Fixes

Windows and macOS: stability and reliability fixes

Full Changelog: step-security/harden-runner@v2.18.0...v2.19.0

Commits

• a5ad31d Merge pull request #657 from devantler/fix/ubuntu-slim-user-env
• 6e92856 build dist and trim ubuntu-slim message
• 4e0504e Merge branch 'main' into fix/ubuntu-slim-user-env
• 8d3c67d Release v2.19.0 (#661)
• 376d25a fix: detect ubuntu-slim runners early and bail out
• See full diff in compare view

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Note

Low Risk
Low risk: this only updates the pinned step-security/harden-runner action used in CI workflows; it may change runner-hardening behavior but does not affect application code or runtime behavior.

Overview
Updates GitHub Actions workflows to use a newer pinned revision of step-security/harden-runner (v2.18.0 → v2.19.1) across test, lint, coverage, and CodeQL jobs.

No workflow logic changes beyond the action version bump; existing egress-policy: audit configuration remains the same.

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