Obtain the science image from env var

Author: BenGalewsky

servicex_codegen/post_operation.py

@@ -35,7 +35,7 @@
 import zipfile
 from tempfile import TemporaryDirectory
 
-from flask import Response, current_app, request
+from flask import Response, request
 from flask_restful import Resource
 from requests_toolbelt import MultipartEncoder
 
@@ -92,7 +92,7 @@ def post(self):
                 zip_data = self.stream_generated_code(generated_code_result)
                 # code gen transformer returns the default transformer image mentioned in
                 # the config file
-                transformer_image = current_app.config.get("TRANSFORMER_SCIENCE_IMAGE")
+                transformer_image = os.environ.get("TRANSFORMER_SCIENCE_IMAGE")
 
                 # MultipartEncoder library takes multiple types of data fields and merge
                 # them into a multipart mime data type