Add SHA256 Support

[Christian Hesse]

"nick" <nick at nicholasjohnson.ch> on Tue, 2023/10/17 01:33:
> I am a satisfied user of Cgit, but I wish it supported SHA-256 repos.
> 
> Gitea will soon support SHA-256:
> 
> https://github.com/go-gitea/gitea/pull/23894
> 
> There is also at least one repository hosting platform which supports
> SHA-256:
> 
> https://sha2git.com/
> 
> According to Git documentation, it should be safe to implement:
> 
> https://git-scm.com/docs/git-init#Documentation/git-init.txt---object-formatltformatgt
> 
> "Historically, we warned that SHA-256 repositories may later need
> backward incompatible changes when we introduce such interoperability
> features. Today, we only expect compatible changes. Furthermore, if such
> changes prove to be necessary, it can be expected that SHA-256
> repositories created with today’s Git will be usable by future
> versions of Git without data loss."

This is a sha256 repository hosted by cgit:

https://git.zx2c4.com/sha256-oid-test/

Support was added around 2020/10/20.
-- 
main(a){char*c=/*    Schoene Gruesse                         */"B?IJj;MEH"
"CX:;",b;for(a/*    Best regards             my address:    */=0;b=c[a++];)
putchar(b-1/(/*    Chris            cc -ox -xc - && ./x    */b/42*2-3)*42);}
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