Add Git trigger

Jenkinsfile

@@ -1,8 +1,20 @@
 node {
 	def img
-    stage('Preparation') { // for display purposes
+	stage("Properties"){
+		properties([
+			[$class: 'GogsTrigger'],		
+			pipelineTriggers([pollSCM('')])
+		])	 
+	}
+
+	stage("Checkout"){
+		git 'https://git.wmi.amu.edu.pl/tzietkiewicz/ium-helloworld.git' 
+	}
+
+	stage('Environment') { // for display purposes
 		img = docker.build('ium-helloworld')
 	}
+
 	stage('Train') {
             img.inside('-v /tmp/mlruns:/tmp/mlruns -v /mlruns:/mlruns ') {
                 sh 'ls -l /tmp/mlruns'