add codeql scanning

.github/workflows/codeql.yml

@@ -0,0 +1,36 @@
+name: CodeQL
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Set up Go 1.x
+      uses: actions/setup-go@v2
+      with:
+        go-version: ^1.16
+
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: '0'
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        queries: +security-and-quality
+        languages: go
+
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1