ci: set up CodeQL analysis

Author: sjinks

.github/workflows/codeql.yml

@@ -0,0 +1,43 @@
+name: CodeQL Analysis
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+    paths:
+      - ".github/**.yml"
+  schedule:
+    - cron: '1 1 * * 3'
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    name: Static Code Analysis with CodeQL
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    strategy:
+      fail-fast: false
+      matrix:
+        language:
+          - actions
+    steps:
+      - name: Checkout repository
+        uses: actions/[email protected]
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/[email protected]
+        with:
+          languages: ${{ matrix.language }}
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/[email protected]
+        with:
+          category: "/language:${{matrix.language}}"