sous custom, 
git clone https://github.com/akretion/fr-einvoicing.git

dans odoo.conf ajouter
    ,/mnt/extra-addons/fr-einvoicing

restart containter odoo
as developper refresh apps, 

install modules : 
   l10n_fr_einvoicing
   l10n_fr_einvoicing_import
   l10n_fr_einvoicing_sale