Update Jenkinsfile to add tracker.jar generation

Jenkinsfile

@@ -11,6 +11,10 @@
             sh 'echo "BUILDING SERVER"'
             sh 'echo Main-Class: serverP2P/ServerP2P > MANIFEST.MF'
             sh 'jar -cvmf MANIFEST.MF server.jar $(find bin/ -maxdepth 1 -mindepth 1 -printf "-C bin %f\n")'
+            sh 'echo "BUILDING TRACKER"'
+            sh 'echo Main-Class: tracker/Tracker > MANIFEST.MF'
+            sh 'jar -cvmf MANIFEST.MF tracker.jar $(find bin/ -maxdepth 1 -mindepth 1 -printf "-C bin %f\n")'
+            sh 'echo "CREATING sources.tar.gz"'
             sh 'tar -zcvf sources.tar.gz src/'
           }
         }
@@ -24,6 +28,7 @@
         success {
           archiveArtifacts artifacts: 'client.jar', fingerprint: true
           archiveArtifacts artifacts: 'server.jar', fingerprint: true
+          archiveArtifacts artifacts: 'tracker.jar', fingerprint: true
           archiveArtifacts artifacts: 'sources.tar.gz', fingerprint: true
         }
       }