flatpak - A Container System

A containerised (flatpak) app remains work in progress.
This requires:

apt install flatpak
apt install flatpak-builder
flatpak install flathub org.freedesktop.Platform//19.08 org.freedesktop.Sdk//19.08
flatpak install flathub org.freedesktop.Sdk.Extension.openjdk11
flatpak-builder --user --install --force-clean inst org.enguage.Eng.yaml
flatpak run --versbose org.enguage.Eng hello

eng.yaml

Please see enguage/app/flatpak/org.enguage.Eng.yaml