Add appservice-double-puppet service for better bridge double-puppeting

Bridges will be switched to this new method in future patches.

roles/custom/matrix-appservice-double-puppet/tasks/install.yml

@@ -0,0 +1,23 @@
+---
+
+- name: Ensure matrix-appservice-double-puppet paths exist
+  ansible.builtin.file:
+    path: "{{ item.path }}"
+    state: directory
+    mode: 0750
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_groupname }}"
+  with_items:
+    - path: "{{ matrix_appservice_double_puppet_base_path }}"
+      when: true
+    - path: "{{ matrix_appservice_double_puppet_config_path }}"
+      when: true
+  when: item.when | bool
+
+- name: Ensure matrix-appservice-double-puppet registration configuration installed
+  ansible.builtin.copy:
+    content: "{{ matrix_appservice_double_puppet_registration_configuration | to_nice_yaml(indent=2, width=999999) }}"
+    dest: "{{ matrix_appservice_double_puppet_config_path }}/registration.yaml"
+    mode: 0644
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_groupname }}"