Hi OpenStacker, 

Linaro has donated a cluster for OpenStack CI on Arm64.
Now the cluster is ready and some jobs(Kolla and disk builder, thanks hrw's hard-working) are running here, https://opendev.org/openstack/project-config/src/branch/master/nodepool/nl03.openstack.org.yaml#L414

Thanks for the help from Infra team and nova team, I am now working on Devstack tempest jobs running on arm64:
https://review.opendev.org/708317

Some changes from Nova also need to be covered in order to make devstack jobs successfully.
https://review.opendev.org/712607
https://review.opendev.org/709494

Yet, there are still a lot of tasks need to fix for arm64 CI work.
If you are interested in this, any forms of help will be really welcomed! let's get together to make arm64 CI happens.