jenkins: add build step

Jenkinsfile

@@ -44,6 +44,9 @@ pipeline {
  	           script {
                     FAILED_STAGE=env.STAGE_NAME
                 }
+                configFileProvider([configFile(fileId: 'maven-settings', variable: 'MAVEN_SETTINGS')]) {
+                     sh 'mvn -s $MAVEN_SETTINGS clean install'
+                }
  	       }
  	   } //stage build
    } //stages