Access Control - Infrastructure FrontEnd configuration

Configure the env variables for the FrontEnd:

NUXT_PUBLIC_KEYCLOAK_URL=https://auth-datamite-ds.iti.es
NUXT_PUBLIC_KEYCLOAK_REALM=datamite
NUXT_PUBLIC_KEYCLOAK_CLIENT_ID=datamite.user.interface
NUXT_PUBLIC_KEYCLOAK_CLIENT_SECRET

The KC client secret value (NUXT_PUBLIC_KEYCLOAK_CLIENT_SECRET) is only assigned in the ITI infra, in the dev.env file, not in the repo.

/cc @hugoloba , @edgarloba