Add Tar ZSTD support (go-gitea#20493)

- Add `.tar.zst` as supported output type.
- Resolves go-gitea#14290

Author: Gusted

cmd/dump.go

@@ -92,7 +92,7 @@ func (o outputType) String() string {
 }
 
 var outputTypeEnum = &outputType{
-	Enum:    []string{"zip", "tar", "tar.sz", "tar.gz", "tar.xz", "tar.bz2", "tar.br", "tar.lz4"},
+	Enum:    []string{"zip", "tar", "tar.sz", "tar.gz", "tar.xz", "tar.bz2", "tar.br", "tar.lz4", "tar.zst"},
 	Default: "zip",
 }