Extract mautrix-signal's `network.displayname_template` configuration into a variable (`matrix_mautrix_signal_network_displayname_template`)

roles/custom/matrix-bridge-mautrix-signal/defaults/main.yml

@@ -48,6 +48,14 @@ matrix_mautrix_signal_msc4190_enabled: "{{ matrix_bridges_msc4190_enabled }}"
 
 matrix_mautrix_signal_command_prefix: "!signal"
 
+# Displayname template for Signal users.
+# {{.ProfileName}} - The Signal profile name set by the user.
+# {{.ContactName}} - The name for the user from your phone's contact list. This is not safe on multi-user instances.
+# {{.PhoneNumber}} - The phone number of the user.
+# {{.UUID}} - The UUID of the Signal user.
+# {{.AboutEmoji}} - The emoji set by the user in their profile.
+matrix_mautrix_signal_network_displayname_template: "{% raw %}{{or .ProfileName .PhoneNumber 'Unknown user'}} (Signal){% endraw %}"
+
 matrix_mautrix_signal_bridge_permissions: |
   {{
     {'*': 'relay', matrix_mautrix_signal_homeserver_domain: 'user'}

roles/custom/matrix-bridge-mautrix-signal/templates/config.yaml.j2

@@ -9,7 +9,7 @@ network:
     # {{.UUID}} - The UUID of the Signal user.
     # {{.AboutEmoji}} - The emoji set by the user in their profile.
     # {% endraw %}
-    displayname_template: "{% raw %}{{or .ProfileName .PhoneNumber 'Unknown user'}} (Signal){% endraw %}"
+    displayname_template: {{ matrix_mautrix_signal_network_displayname_template | to_json }}
     # Should avatars from the user's contact list be used? This is not safe on multi-user instances.
     use_contact_avatars: false
     # Should the bridge request the user's contact list from the phone on startup?