Don't allow jupyter install unless ingress external ip is assigned

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/models/clusters/applications/jupyter.rb

@@ -13,6 +13,14 @@ module Clusters
       default_value_for :version, VERSION
+      def set_initial_status
+        return unless not_installable?
+
+        if cluster&.application_ingress_installed? && cluster.application_ingress.external_ip
+          self.status = 'installable'
+        end
+      end
+
       def chart
         "#{name}/jupyterhub"
       end

app/models/clusters/cluster.rb

@@ -41,6 +41,7 @@ module Clusters
     delegate :active?, to: :platform_kubernetes, prefix: true, allow_nil: true
     delegate :installed?, to: :application_helm, prefix: true, allow_nil: true
+    delegate :installed?, to: :application_ingress, prefix: true, allow_nil: true
     enum platform_type: {
       kubernetes: 1