Initial work on matrix-homeserver-proxy role and eliminating matrix-nginx-proxy

This is still very far from usable.

Various bridges and bots are still talking to
`matrix-nginx-proxy` instead of the new `matrix-homeserver-proxy` role.
These services need to be reworked. While reworking them,
various cleanups are being done as well as adding Traefik-labels to
those that need them.

roles/custom/matrix-bot-postmoogle/tasks/setup_install.yml

@@ -79,6 +79,11 @@
       pull: true
   when: "matrix_bot_postmoogle_container_image_self_build | bool"
 
+- name: Ensure postmoogle container network is created
+  community.general.docker_network:
+    name: "{{ matrix_bot_postmoogle_container_network }}"
+    driver: bridge
+
 - name: Ensure matrix-bot-postmoogle.service installed
   ansible.builtin.template:
     src: "{{ role_path }}/templates/systemd/matrix-bot-postmoogle.service.j2"

roles/custom/matrix-bot-postmoogle/tasks/validate_config.yml

@@ -7,4 +7,6 @@
   when: "item.when | bool and vars[item.name] == ''"
   with_items:
     - {'name': 'matrix_bot_postmoogle_password', when: true}
+    - {'name': 'matrix_bot_postmoogle_container_network', when: true}
+    - {'name': 'matrix_bot_postmoogle_homeserver', when: true}
     - {'name': 'matrix_bot_postmoogle_database_hostname', when: "{{ matrix_bot_postmoogle_database_engine == 'postgres' }}"}