Make "gitea dump" respect hardlinks for backup

[mxmehl]

Description

If I understand correctly, Gitea uses hard links for forked repositories which saves considerable amount of space. Unfortunately, gitea dump saves each file individually because zip cannot work with hard links and dereferences them. By that, large repositories which are forked multiple times take up a lot of space in the backup.

I propose to use tar instead which can cope with hard links. However, I'm not sure whether this is compatible with Gitea on other systems than GNU/Linux, or how hard links work on such operating systems.

[bkcsoft]

Gitea does no such thing. git clone however does that. And it's nothing Gitea can keep track of and is just "random git magic" that we can't handle efficently in gitea dump. And while it's not explicitly stated, gitea dump is sort-of depricated and unmaintained in favour of #1637

[mxmehl]

@bkcsoft Thanks for working on backup. However, I wonder why you cannot use tar instead of zip. This would preserve the magic git created while zip breaks these hard links AFAIK.

[bkcsoft]

Baiscally because Windows compatibility :/

[XANi]

what "windows compability" ? pretty much any popular archive manager supports .tar.gz

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