support runtipi-cli app list and --all

[shuther]

Using a cli, I would like to be able to update all apps. One approach I was thinking was to list all apps and update them all manually with a script.

1. I can't find a command using the cli to show every installed/available apps, proposition is runtipi-cli app list to report install apps and adding --all to report list of available apps.
2. cli should support update of all apps ans skip in case of errors: proposition is to use: runtipi-cli app update --all

[Lockszmith-GH]

came here to ask for this as well.

[AlphaRyz3]

For now i created a PR to automate the update for app stores aka repos, now next PR i'll make it will be to auto update all apps dw