fix: add cwd to sys.path for functions yaml (#12)

Author: jamesdaniels

src/firebase_functions/private/serving.py

@@ -20,6 +20,7 @@
 import enum
 import yaml
 import importlib
+import sys
 from os import kill, getpid
 from signal import SIGTERM
 
@@ -32,6 +33,7 @@
 
 
 def get_functions():
+    sys.path.insert(0, os.getcwd())
     spec = importlib.util.spec_from_file_location("main", "main.py")
     if spec is not None and spec.loader is not None:
         module = importlib.util.module_from_spec(spec)