ci: add explicit CodeQL workflow, replace Default setup

.github/workflows/codeql.yml

@@ -0,0 +1,40 @@
+name: codeql
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  schedule:
+    - cron: "30 7 * * 1"
+
+jobs:
+  analyze:
+    if: ${{ github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository }}
+    name: analyze (${{ matrix.language }})
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      actions: read
+      contents: read
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [rust, python]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@1.95.0
+        if: ${{ matrix.language == 'rust' }}
+      - uses: actions/setup-python@v5
+        if: ${{ matrix.language == 'python' }}
+        with:
+          python-version: "3.12"
+      - name: initialize codeql
+        uses: github/codeql-action/init@v3
+        with:
+          languages: ${{ matrix.language }}
+      - name: autobuild
+        uses: github/codeql-action/autobuild@v3
+      - name: perform analysis
+        uses: github/codeql-action/analyze@v3
+        with:
+          category: /language:${{ matrix.language }}