chore: add codeql

.github/workflows/codeql.yml

@@ -0,0 +1,38 @@
+# Copyright 2026 Beacon Contributors
+# SPDX-License-Identifier: AGPL-3.0-or-later
+name: CodeQL
+
+on:
+  push:
+    branches: [main, dev]
+  pull_request:
+  schedule:
+    - cron: '0 8 * * 1'  # every Monday at 08:00 UTC
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v3
+        with:
+          languages: go
+
+      - name: Build
+        run: go build ./...
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v3