changed default postgres logic and optimized discourse postgres integration

roles/docker-gitlab/README.md

@@ -17,7 +17,6 @@ This Ansible role is designed for setting up and managing a GitLab server runnin
 Variables are defined in `vars/main.yml`. Key variables include:
 - `docker_compose_instance_directory`: Directory for Docker Compose instances.
 - `docker_compose_project_name`, `database_host`, `database_databasename`, `database_username`, `database_password`: Database configuration variables.
-- `database_version`: PostgreSQL version, with a default fallback.
 
 ## Handlers
 - `recreate gitlab`: Restarts GitLab using Docker Compose when changes are detected.

roles/docker-gitlab/vars/main.yml

@@ -1,4 +1,3 @@
 docker_compose_project_name:        "gitlab"
 database_password:                  "{{gitlab_database_password}}"
-database_version:                   "{{ gitlab_database_version | default(postgres_default_version) }}"
 database_type:                      "postgres"