build custom image with new apps
mentioned here: Frequently Asked Questions · frappe/frappe_docker Wiki · GitHub
here: frappe_docker/custom-apps.md at main · frappe/frappe_docker · GitHub
and here: Container Builds - #2 by revant_one
Make sure you try your upgrade locally in development env with set of apps that are needed for your use. If you don’t install required apps, the functionality will be missing from new version.
then upgrade as usual.