I do not know how I can decompress a file having tar.zst extension and even though I did look for solutions on the Internet I ended up having nothing useful regarding the matter.
The extention .zst means that the archive is compressed by zstd.
The tar command has an option -I (--use-compress-program) to specify a command for compression/decompression.
You can use it as follows.
$ tar -I zstd -xvf archive.tar.zst