Jenkinsfile should git-checkout submodules

Jenkinsfile

@@ -2,10 +2,16 @@ pipeline {
 	agent any
 
 	stages {
+		stage('Cloning git sumbodules') {
+			steps {
+				sh 'git submodule update --init --recursive'
+			}
+		}
+
 		stage('Compile') {
 			steps {
-				echo 'Building..'
+				sh 'cmake .'
-				sh 'cmake . && make'
+				sh 'make -j 4'
 			}
 		}
 	}