fix(nix): missing artifact type stringer

internal/artifact/artifact.go

@@ -25,6 +25,7 @@ import (
 // Type defines the type of an artifact.
 type Type int
 
+// If you add more types, update TestArtifactTypeStringer!
 const (
 	// UploadableArchive a tar.gz/zip archive to be uploaded.
 	UploadableArchive Type = iota + 1
@@ -134,6 +135,8 @@ func (t Type) String() string {
 		return "C Shared Library"
 	case WingetInstaller, WingetDefaultLocale, WingetVersion:
 		return "Winget Manifest"
+	case Nixpkg:
+		return "Nixpkg"
 	default:
 		return "unknown"
 	}

internal/artifact/artifact_test.go

@@ -926,3 +926,11 @@ func TestArtifactStringer(t *testing.T) {
 		Name: "foobar",
 	}.String())
 }
+
+func TestArtifactTypeStringer(t *testing.T) {
+	for i := 1; i <= 29; i++ {
+		t.Run(fmt.Sprintf("type-%d-%s", i, Type(i).String()), func(t *testing.T) {
+			require.NotEqual(t, "unknown", Type(i).String())
+		})
+	}
+}