added k8s files and jenkinsfile

k8s/backend/ingress.yaml

@@ -0,0 +1,20 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: backend-ingress
+  namespace: ecommerce
+  annotations:
+    nginx.ingress.kubernetes.io/proxy-body-size: "10m"
+spec:
+  ingressClassName: nginx
+  rules:
+    - host: backend.local
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: backend
+                port:
+                  number: 3000