ci: add scoped CodeQL analysis

Author: GlitterKill

.github/workflows/codeql.yml

@@ -0,0 +1,46 @@
+name: CodeQL
+
+"on":
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  schedule:
+    - cron: "41 8 * * 3"
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    strategy:
+      fail-fast: false
+      matrix:
+        language:
+          - actions
+          - javascript-typescript
+          - python
+          - rust
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v4
+        with:
+          languages: ${{ matrix.language }}
+          build-mode: none
+          config: |
+            paths-ignore:
+              - tests/fixtures/rust/**
+              - tests/stress/fixtures/src/rust/**
+
+      - name: Perform CodeQL analysis
+        uses: github/codeql-action/analyze@v4
+        with:
+          category: "/language:${{ matrix.language }}"