server: allow extra environment variable to ease switch between branch

suggested by Andreas

server/reflector/settings.py

@@ -2,7 +2,11 @@ from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
 class Settings(BaseSettings):
-    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8")
+    model_config = SettingsConfigDict(
+        env_file=".env",
+        env_file_encoding="utf-8",
+        extra="ignore",
+    )
 
     OPENMP_KMP_DUPLICATE_LIB_OK: bool = False