The container images will use the underlying OS license. Microsoft calls it supplmental license.
You are licensed to use this Supplement in conjunction with the
underlying host operating system software (“Host Software”) solely to
assist running the containers feature in the Host Software. The Host
Software license terms apply to your use of the Supplement. You may
not use it if you do not have a license for the Host Software. You may
use this Supplement with each validly licensed copy of the Host
Software.