refactor: yaml -> dotenv

#41

config.py

@@ -1,8 +1,7 @@
 import os
-import yaml
 import socket
 import requests
-
+from dotenv import load_dotenv
 
 def get_public_ip():
     response = requests.get('https://checkip.amazonaws.com')
@@ -24,20 +23,20 @@ def get_private_ip():
 path = os.getcwd()  # 상위 폴더에서 실행된 경우 -> secret_key.yaml이 상위 폴더에 있음
 # path = os.path.dirname(os.path.abspath(__file__)) # 현재 폴더에서 실행된 경우 -> secret_key.yaml이 현재 폴더에 있음
 
-with open(os.path.join(path, "secret_key.yaml"), "r") as yaml_file:
-    cfg = yaml.safe_load(yaml_file)
+load_dotenv(override=True)
 
-OPENAI_API_KEY = cfg["OPENAI_API_KEY"]
-COHERE_API_KEY = cfg["COHERE_API_KEY"]
+MODEL_NAME = os.getenv("MODEL_NAME", "gpt-4o-mini")
+OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
+COHERE_API_KEY = os.getenv("COHERE_API_KEY")
 
 INSIDE_IP = get_private_ip()
 OUTSIDE_IP = get_public_ip()
 
 PORT = 8001
 STREAMLIT_PORT = 8501
 
-CLIENT_ID = cfg["CLIENT_ID"]
-CLIENT_SECRET = cfg["CLIENT_SECRET"]
+CLIENT_ID = os.getenv("CLIENT_ID")
+CLIENT_SECRET = os.getenv("CLIENT_SECRET")
 
 DATA_DIR = os.path.join(path, "data")
 IMG_PATH = os.path.join(path, "data", "images")