fix path manipulation coverity issue

openfl/interface/cli.py

@@ -4,7 +4,7 @@
 """CLI module."""
 import logging
 import os
-import re
+import pathlib
 import sys
 import time
 import warnings
@@ -181,21 +181,7 @@ def cli(context, log_level, no_warnings):
         # Setup logging immediately to suppress unnecessary warnings on import
         # This will be overridden later with user selected debugging level
         disable_warnings()
-    log_file = os.getenv("LOG_FILE")
-    # Validate log_file with tighter restrictions
-    if log_file:
-        log_file = os.path.normpath(log_file)
-        if (
-            not re.match(r"^logs/[\w\-.]+$", log_file)
-            or ".." in log_file
-            or log_file.startswith("/")
-        ):
-            raise ValueError("Invalid log file path")
-        # Ensure the log file is in the 'logs' directory
-        allowed_directory = Path("logs").resolve()
-        full_path = (allowed_directory / log_file).resolve()
-        if not str(full_path).startswith(str(allowed_directory)):
-            raise ValueError("Log file path is not allowed")
+    log_file = pathlib.Path(os.getenv("LOG_FILE")).expanduser().resolve()
     setup_logging(log_level, log_file)
     sys.stdout.reconfigure(encoding="utf-8")