Adding in cancel notifications

data/model/build.py

@@ -197,6 +197,7 @@ def cancel_repository_build(build, build_queue):
   """ This tries to cancel the build returns true if request is successful false if it can't be cancelled """
   with db_transaction():
     from app import build_canceller
+    from buildman.jobutil.buildjob import BuildJobNotifier
     # Reload the build for update.
     # We are loading the build for update so checks should be as quick as possible.
     try:
@@ -210,6 +211,7 @@ def cancel_repository_build(build, build_queue):
     for cancelled in cancel_builds:
       if cancelled():
         build.phase = BUILD_PHASE.CANCELLED
+        BuildJobNotifier(build.uuid).send_notification("build_cancelled")
         build.save()
         return True
     build.phase = original_phase