Refs #21286: Add PR check to use GitHub ref

Signed-off-by: JesusPoderoso <[email protected]>

Author: JesusPoderoso

.github/workflows/codeql-analysis.yml

@@ -43,7 +43,7 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v4
       with:
-        ref: ${{ github.event.inputs.fastcdr-branch  || github.ref || matrix.supported-branches }}
+        ref: ${{ github.event.inputs.fastcdr-branch  || (github.event_name == 'pull_request' && github.ref) || matrix.supported-branches }}
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL