Most time, when invoking `git.OpenRepository`, `objectFormat` will not
be used, so it's a waste to invoke commandline to get the object format.
This PR make it a lazy operation, only invoke that when necessary.
Currently only SHA1 repositories are supported by Gitea. This adds
support for alternate SHA256 with the additional aim of easier support
for additional hash types in the future.
Fixes: #13794
Limited by: https://github.com/go-git/go-git/issues/899
Depend on: #28138
<img width="776" alt="图片" src="5448c9a7-608e-4341-a149-5dd0069c9447">
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Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>