extra_vars and image_name parametrization added

PROD-18791

Change-Id: Ic685ada838833a121b574272fee03796991cbe14
diff --git a/day01-image/template.json b/day01-image/template.json
index 0b957a4..ceb046c 100644
--- a/day01-image/template.json
+++ b/day01-image/template.json
@@ -4,7 +4,7 @@
     "password": "r00tme",
     "do_api_token": "{{ env `DO_API_TOKEN` }}",
     "image_name": "{{ env `IMAGE_NAME` }}",
-    "disk_size": "150000"
+    "disk_size": "50000"
 
   },
   "provisioners": [