app config file removal in codegen - xAOD

Author: shriram192

servicex_codegen/__init__.py

@@ -57,6 +57,9 @@ def create_app(test_config=None, provided_translator=None):
 
     if test_config:
         app.config.from_mapping(test_config)
+    else:
+        if 'CODEGEN_CONFIG_FILE' in os.environ:
+            app.config.from_envvar('CODEGEN_CONFIG_FILE')
 
     with app.app_context():
         translator = provided_translator