internal/rosa: squashfs-tools artifact

The Makefile is very poorly written, so had to be configured through the environment.

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

internal/rosa/all.go

@@ -65,6 +65,7 @@ const (
 	Rsync
 	Sed
 	Setuptools
+	SquashfsTools
 	Toybox
 	toyboxEarly
 	Unzip
@@ -168,6 +169,7 @@ func ResolveName(name string) (p PArtifact, ok bool) {
 		"rsync":             Rsync,
 		"sed":               Sed,
 		"setuptools":        Setuptools,
+		"squashfs-tools":    SquashfsTools,
 		"toybox":            Toybox,
 		"unzip":             Unzip,
 		"wayland":           Wayland,