Added working workflow file

.github/scripts/build_assets/util.py

@@ -2,6 +2,7 @@ from typing import List
 import xml.etree.ElementTree as et
 from pathlib import Path
 import os
+import json
 import platform
 import sys
 import traceback
@@ -24,6 +25,8 @@ def check_svgs(svg_file_paths: List[Path]):
     The style must not contain any 'fill' declarations.
     If any error is found, they will be thrown.
     :param: svg_file_paths, the file paths to the svg to check for.
+    :return: None if there no errors. If there is, return a JSON.stringified
+    list with the error messages in it.
     """
     # batch err messages together so user can fix everything at once
     err_msgs = []
@@ -63,7 +66,8 @@ def check_svgs(svg_file_paths: List[Path]):
             err_msgs.append("\n".join(err_msg))
 
     if len(err_msgs) > 0:
-        raise Exception("Errors found in these files:\n" + "\n\n".join(err_msgs))
+        return "\n\n".join(err_msgs)
+    return 'None'
 
 
 def set_env_var(key: str, value: str, delimiter: str='~'):