Make post-start delay for matrix-synapse configurable

roles/custom/matrix-synapse/defaults/main.yml

@@ -322,6 +322,15 @@ matrix_synapse_systemd_wanted_services_list_default: []
 matrix_synapse_systemd_wanted_services_list_auto: []
 matrix_synapse_systemd_wanted_services_list_custom: []
 
+# Controls how long to sleep for after starting the matrix-synapse container.
+#
+# Delaying, so that the homeserver can manage to fully start and various services
+# that depend on it (`matrix_synapse_systemd_required_services_list` and `matrix_synapse_systemd_wanted_services_list`)
+# may only start after the homeserver is up and running.
+#
+# This can be set to 0 to remove the delay.
+matrix_synapse_systemd_service_post_start_delay_seconds: 10
+
 matrix_synapse_in_container_python_packages_path: "/usr/local/lib/python3.11/site-packages"
 
 # Specifies which template files to use when configuring Synapse.

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

@@ -66,9 +66,9 @@ ExecStartPre={{ devture_systemd_docker_base_host_command_docker }} network conne
 
 ExecStart={{ devture_systemd_docker_base_host_command_docker }} start --attach matrix-synapse
 
-# Intentional delay, so that the homeserver can manage to start and various services
-# that depend on it (After/Requires) may only start after the homeserver is up and running.
-ExecStartPost=-{{ matrix_host_command_sleep }} 10
+{% if matrix_synapse_systemd_service_post_start_delay_seconds > 0 %}
+ExecStartPost=-{{ matrix_host_command_sleep }} {{ matrix_synapse_systemd_service_post_start_delay_seconds }}
+{% endif %}
 
 ExecStop=-{{ devture_systemd_docker_base_host_command_sh }} -c '{{ devture_systemd_docker_base_host_command_docker }} stop --time={{ devture_systemd_docker_base_container_stop_grace_time_seconds }} matrix-synapse 2>/dev/null || true'
 ExecStop=-{{ devture_systemd_docker_base_host_command_sh }} -c '{{ devture_systemd_docker_base_host_command_docker }} rm matrix-synapse 2>/dev/null || true'