fix(synapse): appservice registration was not readable

roles/synapse/tasks/deployment.yml

@@ -71,6 +71,6 @@
       - "synapse.app.homeserver"
       - "-c"
       - "{{ matrix_synapse_base_path }}/homeserver.yaml"
-    user: "{{ synapse_user.uid }}:{{ synapse_user.group }}"
+    user: "{{ synapse_user.uid }}:{{ appservice_group.gid }}"
     volumes: "{{ matrix_synapse_docker_volumes }}"
   when: matrix_synapse_deployment_method == "docker"

roles/synapse/tasks/prepare.yml

@@ -1,9 +1,10 @@
 ---
-- name: create appservice user
+- name: create appservice group
   group:
     name: "matrix-appservices"
     state: present
     system: yes
+  register: appservice_group
 
 - name: create user
   user: