Merge pull request #306 from ckeditor/ci/3714-codeql

Internal: Create `codeql.yml` as a GitHub Workflow.

.github/workflows/codeql.yml

@@ -0,0 +1,41 @@
+name: "CodeQL"
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+  schedule:
+    - cron: '0 22 * * SUN'
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: 'ubuntu-latest'
+    timeout-minutes: 360
+    permissions:
+      security-events: write
+      packages: read
+      actions: read
+      contents: read
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+        - language: javascript-typescript
+          build-mode: none
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v3
+      with:
+        languages: ${{ matrix.language }}
+        build-mode: ${{ matrix.build-mode }}
+        config: |
+          paths-ignore:
+            - tests
+            - scripts
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v3
+      with:
+        category: "/language:${{matrix.language}}"