fix(git): upgrade `gitoxide` to v0.21 (#4277)

* upgrade `gitoxide` to v0.21

This release comes with lenient configuration handling by default,
allowing to open repositories even their configuration values are
invalid (even for git), as long as there are viable defaults.

Furthermore this release adds the ability to open submodule repsitories.

Fixes https://github.com/starship/starship/issues/4266 and
fixes https://github.com/starship/starship/issues/4272

* Assure an object cache is set to speed up `commit.describe()`

Related to https://github.com/starship/starship/issues/4275 bringing
performance to spitting distance compared to git.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/modules/git_commit.rs b/src/modules/git_commit.rs
index bc2fba510..88ab069aa 100644
--- a/src/modules/git_commit.rs
+++ b/src/modules/git_commit.rs
@@ -51,7 +51,9 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
 }
 
 fn git_tag(repo: &Repo) -> Option<String> {
-    let git_repo = repo.open();
+    // allow environment variables like GITOXIDE_OBJECT_CACHE_MEMORY and GITOXIDE_DISABLE_PACK_CACHE to speed up operation for some repos
+    let mut git_repo = repo.open().apply_environment();
+    git_repo.object_cache_size_if_unset(4 * 1024 * 1024);
     let head_commit = git_repo.head_commit().ok()?;
 
     let describe_platform = head_commit.describe().names(AnnotatedTags);