add jenkinsfile for ci

Jenkinsfile

@@ -0,0 +1,25 @@
+node {
+    def app
+
+    stage('Clone repository') {
+        /* Let's make sure we have the repository cloned to our workspace */
+
+        checkout scm
+    }
+
+    stage('Build image') {
+        /* This builds the actual image; synonymous to
+         * docker build on the command line */
+
+        app = docker.build("thisfro/plantex")
+    }
+
+    stage('Test image') {
+        /* Ideally, we would run a test framework against our image.
+         * For this example, we're using a Volkswagen-type approach ;-) */
+
+        app.inside {
+            sh 'echo "Tests passed"'
+        }
+    }
+}