Resolves "no such file or directory" CI error for firebase secret (#4356)

automation/taskcluster/helper/get-secret.py

@@ -12,6 +12,12 @@ import taskcluster
 
 def write_secret_to_file(path, data, key, base64decode=False, json_secret=False, append=False, prefix=''):
     path = os.path.join(os.path.dirname(__file__), '../../../' + path)
+    try:
+        os.makedirs(os.path.dirname(path))
+    except OSError as error:
+        if error.errno != errno.EEXIST:
+            raise
+
     with open(path, 'a' if append else 'w') as f:
         value = data['secret'][key]
         if base64decode: