cmd/mbf: shallow by default

This is going to be used most of the time, with --deep only useful for fetching bootstrap artifacts.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/mbf/main.go

@@ -217,6 +217,11 @@ func main() {
 		&cm.mirror,
 		"r", command.StringFlag("$MBF_REMOTE"),
 		"URL of mirror service",
+	).Flag(
+		&cm.deep,
+		"deep", command.BoolFlag(false),
+		"Cure all inputs even when the required artifact is available "+
+			"via the mirror service",
 	).Flag(
 		&cm.idle,
 		"sched-idle", command.BoolFlag(false),