add code-ql workflow

Author: infeo

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,37 @@
+
+name: "CodeQL"
+
+on:
+  push:
+    branches: [develop, main]
+  pull_request:
+    branches: [develop]
+  schedule:
+    - cron: '0 8 * * 0'
+
+jobs:
+  analyse:
+    name: Analyse
+    runs-on: ubuntu-latest
+    if: "!contains(github.event.head_commit.message, '[ci skip]') && !contains(github.event.head_commit.message, '[skip ci]')"
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 2
+    - uses: actions/setup-java@v1
+      with:
+        java-version: 11
+    - uses: actions/cache@v2
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-maven-
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: java
+    - name: Build
+      run: mvn -B compile
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1