[keycloak-user] Create new authentication flow using kcadm in Docker

[triton oidc]

Hi,

i'm using a docker image, and in the build, i'd like to create a new flow.
However i could not find a way to do this in CLI
Doing it in the GUI is not really what i want

When i try
./kcadm.sh create authentication/flows
i get a
HTTP error - 415 Unsupported Media Type

Does this mean it's not possible ?
If so should a create a feature request ?
my company pay a lot of redhat support, so they could support this feature.

Thanks for any help

Amaury