Use ready-made image for mautrix-telegram on arm64

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/793

group_vars/matrix_servers

@@ -305,7 +305,8 @@ matrix_mautrix_signal_database_password: "{{ matrix_synapse_macaroon_secret_key
 # We don't enable bridges by default.
 matrix_mautrix_telegram_enabled: false
 
-matrix_mautrix_telegram_container_self_build: "{{ matrix_architecture != 'amd64' }}"
+# Images are multi-arch (amd64 and arm64, but not arm32).
+matrix_mautrix_telegram_container_self_build: "{{ matrix_architecture not in ['arm64', 'amd64'] }}"
 
 matrix_mautrix_telegram_systemd_required_services_list: |
   {{