Add configurable Fill Assist rules URL (#7791)

.env.template

@@ -386,6 +386,11 @@
 # HTTP_REQUEST_BLOCK_NON_GLOBAL_IPS=true
 
 ## Client Settings
+## Server-wide Fill Assist rules feed base directory URL, not a JSON file.
+## Defaults to https://fillassist.bitwarden.com.
+## Must be a valid HTTPS URL without credentials, query parameters, fragments, or surrounding whitespace.
+# FILL_ASSIST_RULES_URL=https://fillassist.bitwarden.com
+
 ## Enable experimental feature flags for clients.
 ## This is a comma-separated list of flags, e.g. "flag1,flag2,flag3".
 ## Note that clients cache the /api/config endpoint for about 1 hour and it could take some time before they are enabled or disabled!