Fix bug that prevented user with external nginx from launch (#2003)

* Fix bug that prevented user with external nginx from launch

The backslash was missing and prevented users from starting the bot

* Add necessary config for ext nginx to docs

* Add automatic config for ext nginx, adjust docs

* Remove unneeded and possibly puzzeling documentation

docs/configuring-playbook-bot-maubot.md

@@ -61,10 +61,3 @@ You can expand "Access token" to copy it.
 ![Obatining an admin access token with Element](assets/obtain_admin_access_token_element.png)
 
 **IMPORTANT**: once you copy the token, just close the Matrix client window/tab. Do not "log out", as that would invalidate the token.
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group_vars/matrix_servers

@@ -1125,6 +1125,8 @@ matrix_bot_maubot_registration_shared_secret: |-
     }[matrix_homeserver_implementation]
   }}
 
+matrix_bot_maubot_management_interface_http_bind_port: "{{ '' if matrix_nginx_proxy_enabled else ('127.0.0.1:' + matrix_bot_maubot_management_interface_port | string) }}"
+
 # Postgres is the default, except if not using `matrix_postgres` (internal postgres)
 matrix_bot_maubot_database_engine: "{{ 'postgres' if matrix_postgres_enabled else 'sqlite' }}"
 matrix_bot_maubot_database_password: "{{ '%s' | format(matrix_homeserver_generic_secret_key) | password_hash('sha512', 'mxpup.dsc.db') | to_uuid }}"

roles/matrix-bot-maubot/templates/systemd/matrix-bot-maubot.service.j2

@@ -28,7 +28,7 @@ ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-bot-maubot \
 			{% endfor %}
 			--network={{ matrix_docker_network }} \
 			{% if matrix_bot_maubot_management_interface_http_bind_port %}
-			-p {{ matrix_bot_maubot_management_interface_http_bind_port }}:{{ matrix_bot_maubot_management_interface_port }}
+			-p {{ matrix_bot_maubot_management_interface_http_bind_port }}:{{ matrix_bot_maubot_management_interface_port }} \
 			{% endif %}
 			{{ matrix_bot_maubot_docker_image }} \
  			python3 -m maubot -c /config/config.yaml --no-update