Support for sha256 git repositories

[Digit4lSh4d0w]

Summary

Add support for git repositories using the sha256 object format.

Currently when using a sha256 git repo, all git functions of Zed fail/error.

Steps to trigger the problem:

mkdir /tmp/gitsha256
cd $_
git init --object-format sha256
echo "test" > file.txt
git add file.txt
git commit -m "Add file.txt"
zed .

Log:

[2025-02-01T14:57:13+10:00 ERROR fs] Error { code: -21, klass: 6, message: "unknown object format 'sha256'" }`

Actual Behavior: Everything related to git doesn't work:

• Diff indicators in buffers and editor scrollbars.
• Inline diff toggle and reverts in the editor for unstaged changes.
• Git status in the project panel.
• Branch creating and switching.
• Git blame viewing.

Expected Behavior: Everything related to git should work.

Zed Version and System Specs

Zed: v0.171.4 (Zed)
OS: Linux Wayland arch unknown
Memory: 31.3 GiB
Architecture: x86_64
GPU: AMD Radeon RX 6600 (RADV NAVI23) || radv || Mesa 24.3.4-arch1.1

[notpeter]

Thanks for clear steps -- I can reproduce.