FEATURE: Make the multisite config path configurable...

FEATURE: Make the multisite config path configurable (https://github.com/discourse/discourse/commit/ceb234c2e9b87db11be5033aeac6ce477c63e5cb)

config/discourse.conf

@@ -319,6 +319,10 @@ max_digests_enqueued_per_30_mins_per_site = 10000
 # the application cluster is the same one you are expecting
 cluster_name =
 
+# The YAML file used to configure multisite clusters
+# Empty, no multisite allowed
+multisite_config_path =
+
 # Set trusted ip's for prometheus.
 # Check standard nodes ips.
 prometheus_trusted_ip_allowlist_regex = '(::ffff:188\.18[4-5])|(::ffff:137\.138)'
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