Disable ink-waterfall CI step 🦖 (#1509)

Author: ascjones

.gitlab-ci.yml

@@ -450,7 +450,9 @@ examples-docs:
 
 #### stage:                        ink-waterfall
 
-ink-waterfall:
+# Temporarily disabled until https://github.com/paritytech/ink-waterfall/issues/41
+# is fixed.
+.ink-waterfall:
   stage:                           ink-waterfall
   image:                           paritytech/tools:latest
   <<:                              *kubernetes-env