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="https://github.com/go-gitea/gitea/assets/81045/5448c9a7-608e-4341-a149-5dd0069c9447"> --------- Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com> Co-authored-by: 6543 <6543@obermui.de>