Merge pull request #121 from jhnc-oss/codeql

Enable CodeQL security scan

Author: offa

.github/workflows/codeql.yml

@@ -24,6 +24,6 @@ jobs:
         uses: github/codeql-action/init@v3
         with:
           languages: actions
-          build-mode: none
+          queries: +security-and-quality
       - name: CodeQL Analysis
         uses: github/codeql-action/analyze@v3