ci(security): pin rustsec audit action and supersede #588 (#592)

* fix(workflows): standardize runner configuration for security jobs

* ci(actionlint): add Blacksmith runner label to config

Add blacksmith-2vcpu-ubuntu-2404 to actionlint self-hosted-runner labels config
to suppress "unknown label" warnings during workflow linting.

This label is used across all workflows after the Blacksmith migration.

* fix(actionlint): adjust indentation for self-hosted runner labels

* feat(security): enhance security workflow with CodeQL analysis steps

* fix(security): update CodeQL action to version 4 for improved analysis

* fix(security): remove duplicate permissions in security workflow

* fix(security): revert CodeQL action to v3 for stability

The v4 version was causing workflow file validation failures.
Reverting to proven v3 version that is working on main branch.

* fix(security): remove duplicate permissions causing workflow validation failure

The permissions block had duplicate security-events and actions keys,
which caused YAML validation errors and prevented workflow execution.

Fixes: workflow file validation failures on main branch

* fix(security): remove pull_request trigger to reduce costs

* fix(security): restore PR trigger but skip codeql on PRs

* fix(security): resolve YAML syntax error in security workflow

* refactor(security): split CodeQL into dedicated scheduled workflow

* fix(security): update workflow name to Rust Package Security Audit

* fix(codeql): remove push trigger, keep schedule and on-demand only

* feat(codeql): add CodeQL configuration file to ignore specific paths

* Potential fix for code scanning alert no. 39: Hard-coded cryptographic value

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

* fix(ci): resolve auto-response workflow merge markers

* fix(build): restore ChannelMessage reply_target usage

* ci(workflows): run workflow sanity on workflow pushes for all branches

* ci(workflows): rename auto-response workflow to PR Auto Responder

* ci(workflows): require owner approval for workflow file changes

* ci: add lint-first PR feedback gate

* ci(workflows): split label policy checks from workflow sanity

* ci(workflows): consolidate policy and rust workflow setup

* ci: add safe pull request intake sanity checks

* ci(security): switch audit to pinned rustsec audit-check

---------

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

.github/workflows/security.yml

@@ -16,6 +16,7 @@ permissions:
     contents: read
     security-events: write
     actions: read
+    checks: write
 
 env:
     CARGO_TERM_COLOR: always
@@ -23,13 +24,14 @@ env:
 jobs:
     audit:
         name: Security Audit
-        uses: ./.github/workflows/rust-reusable.yml
+        runs-on: blacksmith-2vcpu-ubuntu-2404
+        timeout-minutes: 20
+        steps:
+            - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+
+            - uses: rustsec/audit-check@69366f33c96575abad1ee0dba8212993eecbe998 # v2.0.0
               with:
-            timeout_minutes: 20
-            toolchain: stable
-            run_command: |
-                cargo install --locked cargo-audit --version 0.22.1
-                cargo audit
+                  token: ${{ secrets.GITHUB_TOKEN }}
 
     deny:
         name: License & Supply Chain

docs/actions-source-policy.md

@@ -19,6 +19,7 @@ Selected allowlist patterns:
 - `DavidAnson/markdownlint-cli2-action@*`
 - `lycheeverse/lychee-action@*`
 - `EmbarkStudios/cargo-deny-action@*`
+- `rustsec/audit-check@*`
 - `rhysd/actionlint@*`
 - `softprops/action-gh-release@*`
 - `sigstore/cosign-installer@*`
@@ -79,6 +80,10 @@ Latest sweep notes:
 - 2026-02-16: Blacksmith migration blocked workflow execution
     - Added allowlist pattern: `useblacksmith/*` for self-hosted runner infrastructure
     - Actions: `useblacksmith/setup-docker-builder@v1`, `useblacksmith/build-push-action@v2`
+- 2026-02-17: Security audit reproducibility/freshness balance update
+    - Added allowlist pattern: `rustsec/audit-check@*`
+    - Replaced inline `cargo install cargo-audit` execution with pinned `rustsec/audit-check@69366f33c96575abad1ee0dba8212993eecbe998` in `security.yml`
+    - Supersedes floating-version proposal in #588 while keeping action source policy explicit
 
 ## Rollback
 

docs/ci-map.md

@@ -24,7 +24,7 @@ Merge-blocking checks should stay small and deterministic. Optional checks are u
 - `.github/workflows/docker.yml` (`Docker`)
     - Purpose: PR docker smoke check and publish images on `main`/tag pushes
 - `.github/workflows/security.yml` (`Security Audit`)
-    - Purpose: dependency advisories (`cargo audit`) and policy/license checks (`cargo deny`)
+    - Purpose: dependency advisories (`rustsec/audit-check`, pinned SHA) and policy/license checks (`cargo deny`)
 - `.github/workflows/release.yml` (`Release`)
     - Purpose: build tagged release artifacts and publish GitHub releases
 - `.github/workflows/label-policy-sanity.yml` (`Label Policy Sanity`)