AppManager: cache helm charts and container images to local registry

Caching container images is disabled until we figure out how to run
container registry behind TLS.

Change-Id: I0253f2a862e5adddff18a82b102f67258151c070
diff --git a/core/installer/derived.go b/core/installer/derived.go
index c3483cf..f623392 100644
--- a/core/installer/derived.go
+++ b/core/installer/derived.go
@@ -10,6 +10,7 @@
 	Namespace     string `json:"namespace"`
 	RepoAddr      string `json:"repoAddr"`
 	AppDir        string `json:"appDir"`
+	ImageRegistry string `json:"imageRegistry,omitempty"`
 }
 
 type Network struct {