openshift/rbac: allow project owners to cancel-builds

This tweaks project-owners RBAC to allow updating a build, in order
to make `cancel-build` work.

Ref: https://pagure.io/fedora-infrastructure/issue/8005
Signed-off-by: Luca BRUNO <luca.bruno@coreos.com>

roles/openshift/project/templates/role-appowners.yml

@@ -79,8 +79,10 @@ rules:
   attributeRestrictions: null
   resources:
   - buildconfigs/instantiate
+  - builds
   verbs:
   - create
+  - update
 - apiGroups:
   - "*"
   attributeRestrictions: null