Linting: Fix type errors in git module

* always explicitly cast path strings into Path object so function calls
are always valid

Author: ByteOtter

src/gardenlinux/git/repository.py

@@ -1,8 +1,8 @@
 # -*- coding: utf-8 -*-
 
-import sys
 from os import PathLike
 from pathlib import Path
+from typing import Union
 
 from pygit2 import Oid
 from pygit2 import Repository as _Repository
@@ -25,7 +25,9 @@ class Repository(_Repository):
                  Apache License, Version 2.0
     """
 
-    def __init__(self, git_directory=".", logger=None, **kwargs):
+    def __init__(
+        self, git_directory: Union[str, PathLike[str]] = ".", logger=None, **kwargs
+    ):
         """
         Constructor __init__(Repository)
 
@@ -38,8 +40,7 @@ def __init__(self, git_directory=".", logger=None, **kwargs):
         if logger is None or not logger.hasHandlers():
             logger = LoggerSetup.get_logger("gardenlinux.git")
 
-        if not isinstance(git_directory, PathLike):
-            git_directory = Path(git_directory)
+        git_directory = Path(git_directory)
 
         if not git_directory.exists():
             raise RuntimeError(f"Git directory given is invalid: {git_directory}")
@@ -107,11 +108,11 @@ def root_repo(self):
 
     @staticmethod
     def checkout_repo(
-        git_directory,
+        git_directory: Union[str, PathLike[str]],
         repo_url=GL_REPOSITORY_URL,
-        branch="main",
-        commit=None,
-        pathspecs=None,
+        branch: str = "main",
+        commit: str | None = None,
+        pathspecs: list[str] | None = None,
         logger=None,
         **kwargs,
     ):
@@ -122,8 +123,7 @@ def checkout_repo(
         :since:  0.10.0
         """
 
-        if not isinstance(git_directory, PathLike):
-            git_directory = Path(git_directory)
+        git_directory = Path(git_directory)
 
         if not git_directory.is_dir() or git_directory.match("/*"):
             raise RuntimeError(