Openstack: Maas + juju

I’m trying to make start the bundle of Openstack with lxd (4 phisical nodes + lxd nodes).
And all the time I’m getting error- acquiring LXD image: no matching image found.
Infrastructure should work offline. I’ve made simple-streams image mirror by :
sstream-mirror --keyring=/usr/share/keyrings/ubuntu-cloudimage-keyring.gpg --progress --max=1 --path=streams/v1/index.sjson Ubuntu Cloud Images $workdir ‘arch=amd64’ ‘release~(bionic)’, and sstreams stored mirror to /var/spool/sstreams/juju.

Please give me an vector how to connect my Juju to my sstream mirror.

Thank you in advance - hope for quick reply.