How to make and install an AppImage of software in other format (deb, flatpak, source)?

[pan4b]

I'm a command line noob, AM noob and Linux semi-noob.

I have been using AM for about two weeks, exploring some of the possibilities and enjoying the ease of use (compared to searching the web, downloading AppImages, making executable, changing directories etc) and the chance to get AppImages and avoid Flatpaks for stuff not in my distro's repos (Linux Mint 22, based on Ubuntu 24.04).

I'd really like to get an up-to-date version of the Falkon web browser (currently 24.12) as an AppImage but the one on AppImageHub is five years old, and Falkon is not listed in AM or toolpack.

And I can find it online only as a Flatpak, a deb or source (I think). I am not sure how/if I can convert one of those into an AppImage with AM. (I think that involves templates/ am -t something?)

Can anyone provide me with an easy-to-follow, step-by-step guide to making a Falkon AppImage with/for AM?
Thanks.

WAIT: I think I just found an official script for building an AppImage: https://invent.kde.org/network/falkon/-/tree/master/linux/appimage?ref_type=heads Can I use that? And give the result to AM?
Does it matter that the script is three years old, or will it build from current code?

[Samueru-sama]

First you should try to request Falkon to start releasing an AppImage: https://invent.kde.org/network/falkon/-/issues

If they can't release an AppImage then ask for some portable binary like firefox does.

Web-browsers usually release as either AppImage or portable binaries, it is rare that falkon doesnt offer either of those.

[pan4b]

So it is not possible (for someone like me, at least) to convert one of the formats they do release into an AppImage?

[Samueru-sama]

So it is not possible (for someone like me, at least) to convert one of the formats they do release into an AppImage?

Yes it is, but ideally you should ask upstream first and if they don{t want/don't show interest you go into making the AppImage.

For example Ivan used to maintain an AppImage of firedragon which is a web browser and recently upstream started making their own.