[CI] Automatically clean up environments on `master` on success
Follow-up to !211 (merged).
Automatically clean up environments on master
on success.
This ensures that releases for master
don't sit around
for 4 days (the auto_stop_in
period). If the jobs fail, however, we'll
have that 4 day period to either debug the environments in the
clusters or the maintainer can dismiss the failures and manually
trigger the cleanup jobs.
Edited by Mitchell Nielsen