Enable label checker (#1000)

Authors:
  - Vyas Ramasubramani (https://github.com/vyasr)

Approvers:
  - Ray Douglass (https://github.com/raydouglass)
  - Peter Andreas Entschev (https://github.com/pentschev)

URL: #1000

.github/ops-bot.yaml

@@ -3,6 +3,6 @@
 
 auto_merger: true
 branch_checker: false
-label_checker: false
+label_checker: true
 release_drafter: false
 recently_updated: true