add pending variable

windows_2016_core_ami.json

@@ -95,7 +95,8 @@
     "iso_checksum": "70721288BBCDFE3239D8F8C0FAE55F1F",
     "iso_checksum_type": "md5",
     "iso_url": "https://software-download.microsoft.com/download/pr/Windows_Server_2016_Datacenter_EVAL_en-us_14393_refresh.ISO",
-    "winrm_timeout": "6h"
+    "winrm_timeout": "6h",
+    "aws_s3_bucket_name": "{{env `AWS_S3_BUCKET`}}"
   }
 }