Add a ytt template value for replica count.

Signed-off-by: Matt Moyer <moyerm@vmware.com>

deploy/deployment.yaml

@@ -58,7 +58,7 @@ metadata:
   labels:
     app: #@ data.values.app_name
 spec:
-  replicas: 2
+  replicas: #@ data.values.replicas
   selector:
     matchLabels:
       app: #@ data.values.app_name

deploy/values.yaml

@@ -7,6 +7,9 @@
 app_name: pinniped
 namespace: pinniped
 
+#! Specify how many replicas of the Pinniped server to run.
+replicas: 2
+
 #! Specify either an image_digest or an image_tag. If both are given, only image_digest will be used.
 image_repo: #! e.g. registry.example.com/your-project-name/repo-name
 image_digest: #! e.g. sha256:f3c4fdfd3ef865d4b97a1fd295d94acc3f0c654c46b6f27ffad5cf80216903c8