ci: use GitHub Hooks to trigger jobs

By using GitHub Hooks, jobs get triggers quickers. It also may prevent
the occasional hickup in the Jenkins GitHub-Pull-Request-Builder while
polling events for the cron-jobs.

Signed-off-by: Niels de Vos <ndevos@redhat.com>

jobs/commitlint.yaml

@@ -29,9 +29,7 @@
           # only run on PRs where the trigger-phrase is posted
           only-trigger-phrase: true
           permit-all: true
-          # TODO: set github-hooks to true when it is configured in GitHub
-          github-hooks: false
-          cron: 'H/5 * * * *'
+          github-hooks: true
           org-list:
             - ceph
           allow-whitelist-orgs-as-admins: true