add kubectl deploy stage

Jenkinsfile

@@ -40,9 +40,16 @@ pipeline {
             }
         }
         stage('deploy') {
+            environment {
+                AWS_ACCESS_KEY_ID = credentials('jenkins_aws_access_key_id')
+                AWS_SECRET_ACCESS_KEY = credentials('jenkins-aws_secret_access_key')
+                APP_NAME = 'java-maven-app'
+            }
             steps {
                 script {
-                   echo 'deploying docker image to EC2...'
+                    echo 'deploying docker image...'
+                    sh 'envsubst < kubernetes/deployment.yaml | kubectl apply -f -'
+                    sh 'envsubst < kubernetes/service.yaml | kubectl apply -f -'
                 }
             }
         }