[Github] Add CodeQL Action to check Github Actions Workflows (#158394)

This should point out obvious security issues with our Github Actions
workflows.

.github/workflows/gha-codeql.yml

diff --git a/.github/workflows/gha-codeql.yml b/.github/workflows/gha-codeql.yml
new file mode 100644
index 0000000..5a7c79d
--- /dev/null
+++ b/.github/workflows/gha-codeql.yml
@@ -0,0 +1,35 @@
+name: Github Actions CodeQL
+
+permissions:
+  contents: read
+
+on:
+  pull_request:
+    branches:
+      - main
+  schedule:
+    - cron: '30 0 * * *'
+
+concurrency:
+  group: ${{ github.workflow }}
+  cancel-in-progress: true
+
+jobs:
+  codeql:
+    name: 'Github Actions CodeQL'
+    runs-on: ubuntu-24.04
+    permissions:
+      security-events: write
+    steps:
+      - name: Checkout LLVM
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          sparse-checkout: |
+            .github/
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@192325c86100d080feab897ff886c34abd4c83a3 # v3.30.3
+        with:
+          languages: actions
+          queries: security-extended
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@192325c86100d080feab897ff886c34abd4c83a3 # v3.30.3