Using https://lab.nexedi.com/jerome/monaco-editor-erp5/ at revision
f59a79d15b7cfbb2f76d53fc01d2aab8e9316d40 and running:

    npm install
    npm run deploy -- --url=http://host:port/erp5/portal_skins/erp5_monaco_editor/monaco-editor --username=user --password=password

then use ERP5Site_setSkinCache to set cache