replace port 8048 with matrix_synapse_container_default_federation_port

roles/matrix-synapse/defaults/main.yml

@@ -146,7 +146,7 @@ matrix_synapse_federation_rr_transactions_per_room_per_second: 50
 
 # Controls whether the TLS federation listener is enabled (tcp/8448).
 # Only makes sense if federation is enabled (`matrix_synapse_federation_enabled`).
-# Note that federation may potentially be enabled as non-TLS on tcp/8048 as well.
+# Note that federation may potentially be enabled as non-TLS on `matrix_synapse_container_default_federation_port` as well.
 # If you're serving Synapse behind an HTTPS-capable reverse-proxy,
 # you can disable the TLS listener (`matrix_synapse_tls_federation_listener_enabled: false`).
 matrix_synapse_tls_federation_listener_enabled: true

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

@@ -302,7 +302,7 @@ listeners:
 {% if matrix_synapse_federation_port_enabled %}
   # Unsecure HTTP listener (Federation API): for when matrix traffic passes through a reverse proxy
   # that unwraps TLS.
-  - port: 8048
+  - port: {{ matrix_synapse_container_default_federation_port }}
     tls: false
     bind_addresses: ['::']
     type: http

roles/matrix-synapse/templates/synapse/systemd/matrix-synapse.service.j2

@@ -46,7 +46,7 @@ ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-synapse \
 			-p {{ matrix_synapse_container_federation_api_tls_host_bind_port }}:8448 \
 			{% endif %}
 			{% if matrix_synapse_federation_enabled and matrix_synapse_container_federation_api_plain_host_bind_port %}
-			-p {{ matrix_synapse_container_federation_api_plain_host_bind_port }}:8048 \
+			-p {{ matrix_synapse_container_federation_api_plain_host_bind_port }}:{{ matrix_synapse_container_default_federation_port }} \
 			{% endif %}
 			{% if matrix_synapse_metrics_enabled and matrix_synapse_container_metrics_api_host_bind_port %}
 			-p {{ matrix_synapse_container_metrics_api_host_bind_port }}:{{ matrix_synapse_metrics_port }} \