[StepSecurity] ci: Harden GitHub Actions (#866)

Signed-off-by: StepSecurity Bot <bot@stepsecurity.io>

Author: step-security-bot

.github/workflows/codeql.yml

@@ -39,6 +39,9 @@ on:
       - 'pdf/**'
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   analyze:
     name: Analyze Rust
@@ -68,6 +71,11 @@ jobs:
     # If you are analyzing a compiled language, you can modify the 'build-mode' for that language to customize how
     # your codebase is analyzed, see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages
     steps:
+    - name: Harden the runner (Audit all outbound calls)
+      uses: step-security/harden-runner@20cf305ff2072d973412fa9b1e3a4f227bda3c76 # v2.14.0
+      with:
+        egress-policy: audit
+
     - name: Checkout repository
       uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1