ci: add CodeQL action

.github/workflows/codeql.yml

@@ -0,0 +1,32 @@
+name: "CodeQL"
+
+on:
+  push:
+    # Run on pushes to specific branches
+    branches:
+      - master
+      - next
+      - beta
+      - alpha
+    # Do not run on tags
+    tags-ignore:
+      - "*"
+  pull_request:
+    # Run on to branches with an open PR
+    branches:
+      - "*"
+  schedule:
+    # At 00:00 on Monday.
+    - cron: '0 0 * * 1'
+
+jobs:
+  CodeQL:
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+    steps:
+      - uses: actions/checkout@v2
+      - uses: github/codeql-action/init@v1
+        with:
+          languages: javascript
+      - uses: github/codeql-action/analyze@v1