Move matrix-ldap-registration-proxy to its own container network and add native Traefik support

This also makes it handle the `/_matrix/client/v3/register` endpoint,
not just `/_matrix/client/r0/register`

roles/custom/matrix-ldap-registration-proxy/tasks/setup_install.yml

@@ -41,6 +41,21 @@
     owner: "{{ matrix_user_username }}"
     group: "{{ matrix_user_groupname }}"
 
+- name: Ensure matrix-ldap-registration-proxy support files installed
+  ansible.builtin.template:
+    src: "{{ role_path }}/templates/{{ item }}.j2"
+    dest: "{{ matrix_ldap_registration_proxy_base_path }}/{{ item }}"
+    mode: 0640
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_groupname }}"
+  with_items:
+    - labels
+
+- name: Ensure matrix-ldap-registration-proxy container network is created
+  community.general.docker_network:
+    name: "{{ matrix_ldap_registration_proxy_container_network }}"
+    driver: bridge
+
 - name: Ensure matrix-ldap-registration-proxy.service installed
   ansible.builtin.template:
     src: "{{ role_path }}/templates/systemd/matrix-ldap-registration-proxy.service.j2"