internal/rosa: helpers for common url formats

This cleans up call site of NewPackage.

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

internal/rosa/procps.go

@@ -7,11 +7,11 @@ func (t Toolchain) newProcps() (pkg.Artifact, string) {
 		version  = "4.0.6"
 		checksum = "pl_fZLvDlv6iZTkm8l_tHFpzTDVFGCiSJEs3eu0zAX6u36AV36P_En8K7JPScRWM"
 	)
-	return t.NewPackage("procps", version, pkg.NewHTTPGetTar(
-		nil, "https://gitlab.com/procps-ng/procps/-/archive/"+
-			"v"+version+"/procps-v"+version+".tar.bz2",
-		mustDecode(checksum),
-		pkg.TarBzip2,
+	return t.NewPackage("procps", version, newFromGitLab(
+		"gitlab.com",
+		"procps-ng/procps",
+		"v"+version,
+		checksum,
 	), nil, &MakeHelper{
 		Generate: "./autogen.sh",
 		Configure: []KV{