feat(UX): warn users during install that postgres is in testing

frappe/commands/site.py

@@ -91,6 +91,19 @@ def new_site(
 
 	frappe.init(site, new_site=True)
 
+	if db_type == "postgres":
+		click.secho(
+			"\nKindly Note: PostgreSQL support is currently in development and considered experimental.",
+			fg="yellow",
+			bold=True,
+		)
+		click.secho(
+			"We are actively fixing schema and performance issues. If you encounter any bugs,\n"
+			"please feel free to report them with a full traceback at:\n"
+			"https://github.com/frappe/frappe/issues\n",
+			fg="cyan",
+		)
+
 	if site in frappe.get_all_apps():
 		click.secho(
 			f"Your bench has an app called {site}, please choose another name for the site.", fg="red"