ci: add codeql configuration

Author: evansims

.github/workflows/codeql.yml

@@ -0,0 +1,46 @@
+# yaml-language-server: $schema=https://www.schemastore.org/github-workflow.json
+
+name: CodeQL
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    # Run weekly on Sundays at 04:00 UTC
+    - cron: "0 4 * * 0"
+
+# Cancel in-progress runs for PRs
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+permissions:
+  contents: read
+  security-events: write
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    if: github.actor != 'dependabot[bot]'
+    permissions:
+      contents: read
+      security-events: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@b56ba49b26e50535fa1e7f7db0f4f7b4bf65d80d # v3.28.10
+        with:
+          languages: actions
+          # CodeQL's Rust support is experimental
+          # Using 'actions' to analyze GitHub Actions workflows for misconfigurations
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@b56ba49b26e50535fa1e7f7db0f4f7b4bf65d80d # v3.28.10
+        with:
+          category: "/language:actions"