[AMSAT-BB] TQSL Linux version to avoid compile it.

I'm one of the Linux user of TQSL, it's annoying to compile the new versions every time.

And the kamal ppa is not working any more, I called to the tqsl support team to test my appimage build script to generate the equivalent of a ".exe" file on linux.

There's no need to compile it anymore, just download it, tag it as executable and run it.

You can see more details in the tweet below I will be happy to help or sort any issues of the generation of a AppImage version of TQSL

https://twitter.com/co7wt/status/1455253643184181250

Cheers, Pavel CO7WT