Run so-preflight during setup

setup/so-functions

@@ -1124,9 +1124,10 @@ detect_os() {
 
 installer_progress_loop() {
 	local i=0
+	local msg="${1:-Performing background actions...}"
 	while true; do
 		[[ $i -lt 98 ]] && ((i++))
-		set_progress_str "$i" 'Checking that all required packages are installed and enabled...' nolog
+		set_progress_str "$i" "$msg" nolog
 		[[ $i -gt 0 ]] && sleep 5s
 	done
 }