internal/rosa: gzip artifact

Toybox does not implement this, and it is used by many programs, including toybox itself.

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

internal/rosa/all.go

@@ -24,6 +24,7 @@ const (
 	Git
 	Go
 	Gperf
+	Gzip
 	Hakurei
 	HakureiDist
 	IniConfig
@@ -100,6 +101,7 @@ func (t Toolchain) ResolveName(name string) (p PArtifact, ok bool) {
 		"git":               Git,
 		"go":                Go,
 		"gperf":             Gperf,
+		"gzip":              Gzip,
 		"hakurei":           Hakurei,
 		"hakurei-dist":      HakureiDist,
 		"iniconfig":         IniConfig,