[FEATURE REQUEST] docker export to tar.gz

Description

Currently docker export command allows to export a container as .tar.

I use docker mainly for creating WSL images (Linux distros) for Microsoft Store and the process needs to work with a .tar.gz archive that is converted in an Appx package.

Windows has not gzip included by default but only tar command.

To prevent the usage of gzip, there is no way to use only tar command to convert to gzip. It is not possible to first unarchive the tar archive and then compress them to tar.gz by tar command because the containers, if Linux based, have errors due to the structure of a Linux filesystem (that is inside the container).

To prevent this and also to separately install gzip, can you please implement a possibility to also export a container as .tar.gz? It can also allow us to export containers in a compressed and less space-consuming archive.

Start with the docker export command and trace how it currently produces a .tar archive. Determine where an optional .tar.gz output can be added, then verify that exporting a container produces a valid compressed archive without requiring a separate gzip command.