fix: signal docker tag follow system arch

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

@@ -9,7 +9,7 @@ matrix_mautrix_signal_container_image_self_build_repo: "https://mau.dev/mautrix/
 matrix_mautrix_signal_container_image_self_build_branch: "{{ 'main' if matrix_mautrix_signal_version == 'latest' else matrix_mautrix_signal_version }}"
 
 # renovate: datasource=docker depName=dock.mau.dev/mautrix/signal
-matrix_mautrix_signal_version: fb18dcebcf611375ef4887041bc3b79008246178-amd64
+matrix_mautrix_signal_version: fb18dcebcf611375ef4887041bc3b79008246178-{{ matrix_architecture }}
 
 # See: https://mau.dev/mautrix/signal/container_registry
 matrix_mautrix_signal_docker_image: "{{ matrix_mautrix_signal_docker_image_name_prefix }}mautrix/signal:{{ matrix_mautrix_signal_version }}"