Cherry-pick #21154 to 7.x: [packaging] use docker.elastic.co/ubi8/ubi-minimal#21207

Merged

axw merged 1 commit intoelastic:7.xfrom axw:backport_21154_7.x

Sep 23, 2020

Commits on Sep 22, 2020

[packaging] use docker.elastic.co/ubi8/ubi-minimal (elastic#21154 )
axw
committed