add matrix_synapse_admin_contact var

roles/custom/matrix-synapse/defaults/main.yml

@@ -374,6 +374,10 @@ matrix_synapse_registration_shared_secret: "{{ matrix_synapse_macaroon_secret_ke
 matrix_synapse_allow_guest_access: false
 matrix_synapse_form_secret: "{{ matrix_synapse_macaroon_secret_key }}"
 
+
+# Controls how to reach server admin, used in ResouceLimitError
+matrix_synapse_admin_contact: ~
+
 matrix_synapse_max_upload_size_mb: 50
 
 # Controls whether local media should be removed under certain conditions, typically for the purpose of saving space.

roles/custom/matrix-synapse/templates/synapse/homeserver.yaml.j2

@@ -391,7 +391,7 @@ manhole_settings:
 
 # How to reach the server admin, used in ResourceLimitError
 #
-#admin_contact: 'mailto:admin@example.com'
+admin_contact: {{ matrix_synapse_admin_contact | to_json }}
 
 # Global blocking
 #