ci(codeql): scan the workflows and every language in one code-ql job

.github/workflows/code-ql.yml

@@ -0,0 +1,38 @@
+name: CodeQL
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+  schedule:
+    - cron: '0 5 * * 1'
+  workflow_dispatch:
+
+permissions: {}
+
+jobs:
+  # CodeQL has no PHP support, so this scans the workflows (actions). One job, so the required check context is
+  # exactly `code-ql`.
+  code-ql:
+    name: code-ql
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@6f2ac81f5cd81fe351a197ba0b00d91d03cd2aee # v4.39.0
+        with:
+          languages: actions
+          build-mode: none
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@6f2ac81f5cd81fe351a197ba0b00d91d03cd2aee # v4.39.0