Add Applications::Jupyter class sceleton

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

app/models/clusters/applications/jupyter.rb

+module Clusters
+  module Applications
+    class Jupyter < ActiveRecord::Base
+      VERSION = '0.0.1'.freeze
+
+      self.table_name = 'clusters_applications_jupyters'
+
+      include ::Clusters::Concerns::ApplicationCore
+      include ::Clusters::Concerns::ApplicationStatus
+      include ::Clusters::Concerns::ApplicationData
+
+      default_value_for :version, VERSION
+
+      def chart
+        # TODO: publish jupyterhub charts that we can use for our installation
+        # and provide path to it here.
+      end
+
+      def install_command
+        Gitlab::Kubernetes::Helm::InstallCommand.new(
+          name,
+          chart: chart,
+          values: values
+        )
+      end
+    end
+  end
+end

app/models/clusters/cluster.rb

@@ -8,7 +8,8 @@ module Clusters
       Applications::Helm.application_name => Applications::Helm,
       Applications::Ingress.application_name => Applications::Ingress,
       Applications::Prometheus.application_name => Applications::Prometheus,
-      Applications::Runner.application_name => Applications::Runner
+      Applications::Runner.application_name => Applications::Runner,
+      Applications::Jupyter.application_name => Applications::Jupyter
     }.freeze
     DEFAULT_ENVIRONMENT = '*'.freeze