feat: jujustu support

If the .git directory can't be opened (usually because the `.git` directory is missing) it attempts to find the git repository in the location used by Jujutsu (i.e. `.jj/repo/store/git`). If the Jujutsu git directory doesn't exist, then the origin error is propogated.

git-cliff-core/src/repo.rs

@@ -48,7 +48,15 @@ impl Repository {
 	/// Initializes (opens) the repository.
 	pub fn init(path: PathBuf) -> Result<Self> {
 		if path.exists() {
-			let inner = GitRepository::open(&path)?;
+			let inner = GitRepository::open(&path).or_else(|err| {
+				let jujutsu_path =
+					path.join(".jj").join("repo").join("store").join("git");
+				if jujutsu_path.exists() {
+					GitRepository::open(&jujutsu_path)
+				} else {
+					Err(err)
+				}
+			})?;
 			let changed_files_cache_path = inner
 				.path()
 				.join(env!("CARGO_PKG_NAME"))