fix checkoutservice ports

kubernetes-manifests/checkoutservice.yaml

@@ -37,6 +37,8 @@ spec:
             exec:
               command: ["/bin/grpc_health_probe", "-addr=:5050"]
           env:
+          - name: PORT
+            value: "5050"
           - name: PRODUCT_CATALOG_SERVICE_ADDR
             value: "productcatalogservice:3550"
           - name: SHIPPING_SERVICE_ADDR