Solved wrong namings

roles/cmp-rdbms-orchestrator/templates/services/postgres.yml.j2

@@ -1,7 +1,7 @@
 # This template needs to be included in docker-compose.yml, which depend on a postgres database
 {% if not applications | is_feature_enabled('central_database',application_id) %}  
   {{ database_host }}:
-    image: postgres:{{applications.postgres.version}}-alpine
+    image: postgres:{{applications['rdbms-postgres'].version}}-alpine
     container_name: {{application_id}}-database
     env_file:
       - {{database_env}}