github/workflow: add CodeQL workflow (#111)

Author: zchee

.github/workflows/codeql.yml

@@ -0,0 +1,36 @@
+name: CodeQL
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  schedule:
+    - cron: '0 20 * * *'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-20.04
+
+    strategy:
+      fail-fast: false
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@main
+
+    - name: Install Go
+      uses: actions/setup-go@main
+      with:
+        go-version: 1.16.x
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: go
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1