Use env in service manifests for PORT (#212)

* fix shipping service ports

* fix product catalog servicde ports

* fix paymentservice ports

* fix currenservice ports

* fix checkoutservice ports

* fix emailservice ports

* fix frontend app ports

* fix recommendationservice ports

* fix indentation in service yaml files

kubernetes-manifests/currencyservice.yaml

@@ -32,6 +32,9 @@ spec:
         ports:
         - name: grpc
           containerPort: 7000
+        env:
+        - name: PORT
+          value: "7000"
         readinessProbe:
           exec:
             command: ["/bin/grpc_health_probe", "-addr=:7000"]