Refactor docker compose exec usage

Introduce centralized variables:
- docker_compose_command_base
- docker_compose_command_exec

Replaced hardcoded 'docker compose exec' with '{{ docker_compose_command_exec }}'
across multiple roles (BigBlueButton, EspoCRM, Friendica, Listmonk, Mailu, Matrix, OpenProject).
Ensures consistent environment file loading and reduces duplicated code.

Details: https://chatgpt.com/share/68d6a276-19d0-800f-839d-d191d97f7c41

roles/web-app-bigbluebutton/tasks/02_administrator.yml

@@ -16,7 +16,7 @@
     - name: "Create default admin"
       command:
         cmd: >
-            docker compose exec greenlight
+            {{ docker_compose_command_exec }} greenlight
             bundle exec rake admin:create['{{ users.administrator.username | upper }}','{{ users.administrator.email }}','{{ users.administrator.password }}']
         chdir: "{{ docker_compose.directories.instance }}"
       register: admin_creation_result
@@ -26,6 +26,6 @@
     - name: "Make existing user administrator"
       command:
         cmd: >
-          docker compose exec greenlight
+          {{ docker_compose_command_exec }} greenlight
           bundle exec rake user:set_admin_role['{{ users.administrator.email }}']
         chdir: "{{ docker_compose.directories.instance }}"

roles/web-app-bigbluebutton/vars/main.yml

@@ -42,4 +42,4 @@ BBB_COTURN_ENABLED:                   "{{ applications | get_app_conf(applicatio
 
 ### SSO
 BBB_LDAP_ENABLED:                     "{{ applications | get_app_conf(application_id, 'features.ldap') }}"
-BBB_OIDC_ENABLED:                     "{{ applications | get_app_conf(application_id, 'features.oidc') }}"
+BBB_OIDC_ENABLED:                     "{{ applications | get_app_conf(application_id, 'features.oidc') }}"