internal/pkg: exclusive artifacts

This alleviates scheduler overhead when curing many artifacts.

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

internal/rosa/libseccomp.go

@@ -9,7 +9,7 @@ func (t Toolchain) newLibseccomp() pkg.Artifact {
 		version  = "2.6.0"
 		checksum = "mMu-iR71guPjFbb31u-YexBaanKE_nYPjPux-vuBiPfS_0kbwJdfCGlkofaUm-EY"
 	)
-	return t.New("libseccomp-"+version, []pkg.Artifact{
+	return t.New("libseccomp-"+version, false, []pkg.Artifact{
 		t.Load(Make),
 		t.Load(Bash),
 		t.Load(Gperf),