As following tutorials i would like to create registry in digital ocean.
I do:

➜  do-kube-cluster-fra1 doctl registry login -t "XXXXXXXXXX" --output json
Logging Docker in to registry.digitalocean.com
{"errors":[{"detail":"GET https://api.digitalocean.com/v2/registry/docker-credentials?read_write=true: 412 registry not configured for user"}]}

ok, i don’t have any registry in my account so i do a:

➜  do-kube-cluster-fra1 doctl registry create qovery -t "XXXXXXXXX"      
Error: POST https://api.digitalocean.com/v2/registry: 422 invalid subscription tier slug

But I don’t have anything, and I don’t understand the meaning of subscription tier slug