Add CodeQL security scanning

Author: hyperpolymath

.github/workflows/codeql.yml

@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+name: CodeQL
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: "0 6 * * 1"
+permissions: read-all
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [actions]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@662472033e021d55d94146f66f6058822b0b39fd # v3
+        with:
+          languages: ${{ matrix.language }}
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@662472033e021d55d94146f66f6058822b0b39fd # v3
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@662472033e021d55d94146f66f6058822b0b39fd # v3
+        with:
+          category: "/language:${{ matrix.language }}"
+