Add missing smtp service to kubernetes

tutor/templates/k8s/deployments.yml

@@ -242,6 +242,27 @@ spec:
             claimName: mysql
 {% endif %}
 
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: smtp
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: smtp
+  template:
+    metadata:
+      labels:
+        app: smtp
+    spec:
+      containers:
+        - name: smtp
+          image: {{ DOCKER_REGISTRY }}{{ DOCKER_IMAGE_SMTP }}
+          ports:
+            - containerPort: 25
+
 ---
 apiVersion: apps/v1
 kind: Deployment

tutor/templates/k8s/services.yml

@@ -130,3 +130,16 @@ spec:
   selector:
     app: rabbitmq
 {% endif %}
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: smtp
+spec:
+  type: NodePort
+  ports:
+    - port: 25
+      protocol: TCP
+  selector:
+    app: smtp