Jenkins config dependencies

- added extra task to install dependencies for time tracking

Jenkinsfile

@@ -2,12 +2,20 @@ pipeline {
     agent any
 
     stages {
+        stage('Dependencies') {
+            steps {
+                echo 'Installing Dependencies...'
+                nodejs(nodeJSInstallationName: 'Node 12.x') {
+                    sh 'npm i @angular/cli'
+                    sh 'npm i'
+                    sh 'tslint "src/**/*.ts"'
+                }
+            }
+        }
         stage('Stylecheck') {
             steps {
                 echo 'Checking Style...'
                 nodejs(nodeJSInstallationName: 'Node 12.x') {
-                sh 'npm i'
-                sh 'npm i typescript tslint'
                     sh 'tslint "src/**/*.ts"'
                 }
             }
@@ -16,7 +24,6 @@ pipeline {
             steps {
                 echo 'Building...'
                 nodejs(nodeJSInstallationName: 'Node 12.x') {
-                    sh 'npm i @angular/cli'
                     sh 'ng build --prod'
                 }
             }