Update CodeQL GitHub workflow (#3321)

This updates the workflow to be consistent with the newly setup workflow in
PowerShellEditorServices, which is much simpler.

Author: andyleejordan

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,42 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ master ]
+    tags: [ v* ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+    paths-ignore: [ '**/*.md' ]
+  schedule:
+    - cron: '00 14 * * *' # Every morning at 7:00am PDT
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'typescript' ]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1