[DO-1239] add_backend_ci (!48)

добавил pipeline для сборки cloud-messenger-backend-api

Co-authored-by: Rustam Tagaev <rustam.tagaev@avroid.tech>
Reviewed-on: https://git.avroid.tech/DevOps/jenkins-pipelines/pulls/48
Reviewed-by: Denis Patrakeev <denis.patrakeev@avroid.team>
Co-authored-by: Rustam Tagaev <rustam.tagaev@avroid.team>
Co-committed-by: Rustam Tagaev <rustam.tagaev@avroid.team>

jobs-dsl/folders/Cloud.groovy

@@ -0,0 +1,9 @@
+folder('Cloud') {
+    displayName('Cloud')
+    description('Cloud projects')
+}
+
+folder('Cloud/Apps-Backend') {
+    displayName('Apps-Backend')
+    description('Apps-Backend organization')
+}