Add GitLab cluster id to jupyter config

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

app/models/clusters/applications/jupyter.rb

@@ -73,6 +73,11 @@ module Clusters
               "clientSecret" => oauth_application.secret,
               "callbackUrl" => callback_url
             }
+          },
+          "singleuser" => {
+            "extraEnv" => {
+              "GITLAB_CLUSTER_ID" => cluster.id
+            }
           }
         }
       end

spec/models/clusters/applications/jupyter_spec.rb

@@ -108,8 +108,15 @@ describe Clusters::Applications::Jupyter do
       expect(values).to include('rbac')
       expect(values).to include('proxy')
       expect(values).to include('auth')
+      expect(values).to include('singleuser')
       expect(values).to match(/clientId: '?#{application.oauth_application.uid}/)
       expect(values).to match(/callbackUrl: '?#{application.callback_url}/)
     end
+
+    context 'when cluster belongs to a project' do
+      it 'sets GitLab project id' do
+        expect(values).to match(/GITLAB_CLUSTER_ID: '?#{application.cluster.id}/)
+      end
+    end
   end
 end