Add matrix_bridges_msc4190_enabled flag for using msc4190 on supported mautrix bridges.

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

@@ -36,6 +36,8 @@ matrix_mautrix_gmessages_homeserver_address: ""
 matrix_mautrix_gmessages_homeserver_domain: "{{ matrix_domain }}"
 matrix_mautrix_gmessages_appservice_address: "http://matrix-mautrix-gmessages:8080"
 
+matrix_mautrix_gmessages_msc4190_enabled: "{{ matrix_bridges_msc4190_enabled }}"
+
 matrix_mautrix_gmessages_backfill_enabled: true
 matrix_mautrix_gmessages_backfill_max_initial_messages: 50
 matrix_mautrix_gmessages_backfill_max_catchup_messages: 500
@@ -212,5 +214,6 @@ matrix_mautrix_gmessages_registration_yaml: |
       - exclusive: true
         regex: '^@{{ matrix_mautrix_gmessages_appservice_bot_username | regex_escape }}:{{ matrix_mautrix_gmessages_homeserver_domain | regex_escape }}$'
   de.sorunome.msc2409.push_ephemeral: true
+  io.element.msc4190: {{ matrix_mautrix_gmessages_msc4190_enabled }}
 
 matrix_mautrix_gmessages_registration: "{{ matrix_mautrix_gmessages_registration_yaml | from_yaml }}"

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

@@ -354,6 +354,11 @@ encryption:
     # Whether to use MSC2409/MSC3202 instead of /sync long polling for receiving encryption-related data.
     # This option is not yet compatible with standard Matrix servers like Synapse and should not be used.
     appservice: {{ matrix_mautrix_gmessages_bridge_encryption_appservice | to_json }}
+    # Whether to use MSC4190 instead of appservice login to create the bridge bot device.
+    # Requires the homeserver to support MSC4190 and the device masquerading parts of MSC3202.
+    # Only relevant when using end-to-bridge encryption, required when using encryption with next-gen auth (MSC3861).
+    # Changing this option requires updating the appservice registration file.
+    msc4190: {{ matrix_mautrix_gmessages_msc4190_enabled }}
     # Enable key sharing? If enabled, key requests for rooms where users are in will be fulfilled.
     # You must use a client that supports requesting keys from other users to use this feature.
     allow_key_sharing: {{ matrix_mautrix_gmessages_bridge_encryption_key_sharing_allow | to_json }}