chore: env path refactor (#3691)

Co-authored-by: Suchintan <suchintan@users.noreply.github.com>
Co-authored-by: Shuchang Zheng <wintonzheng0325@gmail.com>

skyvern/cli/llm_setup.py

@@ -1,15 +1,15 @@
-from pathlib import Path
-
 from dotenv import load_dotenv, set_key
 from rich.panel import Panel
 from rich.prompt import Confirm, Prompt
 
+from skyvern.utils.env_paths import resolve_backend_env_path
+
 from .console import console
 
 
 def update_or_add_env_var(key: str, value: str) -> None:
     """Update or add environment variable in .env file."""
-    env_path = Path(".env")
+    env_path = resolve_backend_env_path()
     if not env_path.exists():
         env_path.touch()
         defaults = {