- Instead of invoking a new git command to check if a reference exists, use the already opened git repository that uses a batch check to check if the reference exists.
- Instead of invoking a new git command to check if a branch exists, use the already opened git repository that uses a batch check to check if the branch exists.
- Do not depend on `IsReferenceExist` as its no longer used by any other function.
- Specify `--quiet` to not waste Git's time on printing something we do not use.
- Run it via `Run` so no buffers are created for stdout and stderr.
- Add a test that verifies `IsBranchExist` works and does not work for other types of references.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8425
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>
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