Merge pull request 'feat: Merge the mock support and configuration optimization from the Nicolas_service_hub branch' (#13) from Nicolas_service_hub into dev

Reviewed-on: freeleaps/freeleaps-service-hub#13
Reviewed-by: jingyao1991 <jingyao1991@noreply.gitea.freeleaps.mathmast.com>

apps/authentication/common/config/app_settings.py

@@ -1,10 +1,11 @@
+import os
 from pydantic_settings import BaseSettings
 
 
 class AppSettings(BaseSettings):
     NAME: str = "authentication"
     APP_NAME: str = NAME
-    APP_ENV: str = "alpha"
+    APP_ENV: str = os.environ.get("APP_ENV", "alpha")
 
     METRICS_ENABLED: bool = False
     PROBES_ENABLED: bool = True