adds jenkinsfile

Jenkinsfile

@@ -0,0 +1,45 @@
+pipeline {
+  environment {
+    imagename = "phaefelfinger/tv7playlist"
+    registryCredential = 'phdockerhub'
+    dockerImage = ''
+  }
+  
+  agent { node { label 'docker' } }
+
+  stages {
+    stage('Cloning repository') {
+      steps {
+        checkout scm
+      }
+    }
+
+    stage('Building image') {
+      steps{
+        script {
+          dockerImage = docker.build imagename
+        }
+      }
+    }
+
+    stage('Publishing image') {
+      steps{
+        script {
+          docker.withRegistry( '', registryCredential ) {
+            dockerImage.push('latest')
+            dockerImage.push('3.1')
+            dockerImage.push('3.1.0')
+          }
+        }
+      }
+    }
+
+    stage('Remove unused docker image') {
+      steps{
+        sh "docker rmi $imagename:latest"
+        sh "docker rmi $imagename:3.1"
+        sh "docker rmi $imagename:3.1.0"
+      }
+    }
+  }
+}