Add check_run trigger, don't comment

Add check_run trigger, so that clicking "re-run" on failed jobs will
trigger a fresh run.

Don't comment as we are now using the checks API

Change-Id: Iba0d579861bf24d40e417de8a875262edc9c903c

zuul.d/pipelines.yaml

@@ -1,4 +1,4 @@
-# Shared zuul config specific to the OpenStack Project
+# Shared zuul config specific to the pyca
 # Contains definitions of pipelines
 
 - pipeline:
@@ -34,6 +34,7 @@
             - opened
             - changed
             - reopened
+        - event: check_run
         - event: pull_request
           action: comment
           comment: (?i)^\s*recheck\s*$
@@ -47,12 +48,14 @@
         Verified: 1
       github:
         check: 'success'
+        comment: false
       mysql:
     failure:
       gerrit:
         Verified: -1
       github:
         check: 'failure'
+        comment: false
       mysql:
 
 - pipeline: