add submodule to github-actions script

Author: firasrg

.github/workflows/maven-build.yml

@@ -13,11 +13,15 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
+        with:
+          submodules: 'recursive'
+
       - name: Set up JDK 17
         uses: actions/setup-java@v2
         with:
           java-version: '17'
           distribution: 'temurin'
           cache: maven
+
       - name: Build with Maven
         run: mvn -B install --file pom.xml -Djacoco.skip=true -DdisableXmlReport=true