nsm: Switch periodic jobs from timed to pollscm

So we don't unnecessarily build images if there is no change in Git.

Change-Id: I5e513a61cf382840cd68dd6e805b007acb728e44
1 file changed
tree: 6d90b6088022c600b91e2d3591cb8822f1b92030
  1. jjb/
  2. .gitignore
  3. .gitreview
  4. .yamllint
  5. tox.ini