document Jenkins user permissions
document Jenkins user permissions

This document the required permissions of the Zuul Jenkins user.

Change-Id: Id977e3813f943b032c7628d8cdc663b3bdbb688d
Reviewed-on: https://review.openstack.org/16528
Reviewed-by: Jeremy Stanley <98883b97e35b7bb1ac282bb863f2e9d917db0454@yuggoth.org>
Approved: Clark Boylan <635fc31d01fa593720982fa0568e87170cedbe2c@gmail.com>
Reviewed-by: Clark Boylan <635fc31d01fa593720982fa0568e87170cedbe2c@gmail.com>
Tested-by: Jenkins

devdattakulkarni/zuul_messaging,wikimedia/integration-zuul,wikimedia/integration-zuul,wikimedia/integration-zuul,gooddata/zuul,gooddata/zuul,devdattakulkarni/zuul_messaging,gooddata/zuul,devdattakulkarni/zuul_messaging,wikimedia/integration-zuul,gooddata/zuul,gooddata/zuul