Chore: Bump step-security/harden-runner from 2.16.0 to 2.19.4

[dependabot]

Bumps step-security/harden-runner from 2.16.0 to 2.19.4.

Release notes

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

v2.19.4

What's Changed

• Improvements for HTTPS Monitoring for the Enterprise tier of Harden Runner

Full Changelog: step-security/harden-runner@v2.19.3...v2.19.4

v2.19.3

What's Changed

• Default to audit mode when api-key missing with use-policy-store by @​varunsh-coder in step-security/harden-runner#665

Full Changelog: step-security/harden-runner@v2.19.2...v2.19.3

v2.19.2

What's Changed

• Update the Harden Runner agent for enterprise tier to use go 1.26 and fix minor bugs.

Full Changelog: step-security/harden-runner@v2.19.1...v2.19.2

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

... (truncated)

Commits

• 9af89fc Merge pull request #667 from step-security/update-agent-v1.8.6
• 485dce8 Update agent to v1.8.6
• ab7a940 Merge pull request #665 from step-security/fix/use-policy-store-default-audit
• ec41b78 Default to audit mode when api-key missing with use-policy-store
• 9ca718d Merge pull request #664 from step-security/update-agent-v1.8.5
• 1dee3df Update agent to v1.8.5
• 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)
• Additional commits viewable in compare view

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[github-actions]

PR: #47
Mode: squash
Topic: GH-releng-docs-conf-47
Change-Ids:
I8c970ac7212ea35ae4ee7bb078d38b09ce5541c9
Digest: 5ec1d1d2d325
GitHub-Hash: 92fc156313f36db9

Note: This metadata is also included in the Gerrit commit message for reconciliation.

[github-actions]

Change raised in Gerrit by GitHub2Gerrit: https://gerrit.linuxfoundation.org/infra/c/releng/docs-conf/+/74320

[github-actions]

Auto-closing pull request

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