Add schedule for running CodeQL scan (#4054)

Author: rzuckerm

.github/workflows/codeql-analysis.yml

@@ -45,6 +45,9 @@ on:
       - 'archive/r/ruby/*.rb'
       - 'archive/s/swift/*.swift'
       - 'archive/t/typescript/*.ts'
+  schedule:
+    # Run every Thursday at 4:53 UTC (randomly chosen)
+    - cron: '53 4 * * 6'
 
 jobs:
   # We need this job to check if changed files should trigger analysis
@@ -77,7 +80,7 @@ jobs:
     - name: Get CodeQL Languages
       id: set-matrix
       run: |
-        matrix=$(python scripts/get_codeql_languages.py ${{ steps.changed-files.outputs.all_changed_files }})
+        matrix=$(python scripts/get_codeql_languages.py --event ${{ github.event_name}} ${{ steps.changed-files.outputs.all_changed_files }})
         echo "${matrix}"
         echo "matrix={\"include\": ${matrix}}" >> $GITHUB_OUTPUT
 

scripts/get_codeql_languages.py

@@ -40,12 +40,16 @@ class LanguageInfo:
 
 def main():
     parser = argparse.ArgumentParser()
+    parser.add_argument("--event", help="GitHub event")
     parser.add_argument("files_changed", nargs="*", help="files that have changed")
     parsed_args = parser.parse_args()
     languages: Set[LanguageInfo] = set()
     language_paths: DefaultDict[str, Set[str]] = defaultdict(set)
     language_paths_ignore: DefaultDict[str, Set[str]] = defaultdict(set)
-    if set(parsed_args.files_changed) & ALL_CODEQL_LANGUAGES_FILES:
+    if (
+        parsed_args.event == "schedule"
+        or set(parsed_args.files_changed) & ALL_CODEQL_LANGUAGES_FILES
+    ):
         for glob, language_info in CODEQL_LANGUAGES.items():
             languages.add(language_info)
             language_paths[language_info.language].add(glob)