ci: add CodeQL analysis for Python and GitHub Actions

.github/codeql/codeql-config.yml

@@ -0,0 +1,6 @@
+name: "CodeQL Config"
+
+# Run the extended "security-and-quality" query suite (a superset of the
+# default security queries) for every analyzed language.
+queries:
+  - uses: security-and-quality

.github/workflows/codeql-vulnerability-checks.yml

@@ -0,0 +1,45 @@
+name: "CodeQL Vulnerability Checks"
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: "0 6 * * 1"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    permissions:
+      security-events: write
+      contents: read
+      actions: read
+    strategy:
+      fail-fast: false
+      matrix:
+        language:
+          - python
+          - actions
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v7
+        with:
+          persist-credentials: false
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v4
+        with:
+          languages: ${{ matrix.language }}
+          config-file: ./.github/codeql/codeql-config.yml
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v4
+        with:
+          category: "/language:${{ matrix.language }}"