Fixes the AppImage on non-Fedora systems.
Two bugs meant the AppImage effectively only ran on the machine it was built on:
- It was built on Fedora 44 and inherited its glibc 2.43 floor, so it refused to start on almost every other distro. The Linux build now happens in CI on an older base — the AppImage requires glibc 2.39+ (Ubuntu 24.04+, Debian 13+, Fedora 40+).
- Its bundled TLS stack had no usable certificate store or TLS backend off Fedora, which broke artwork and every stream URL. It now uses the host's, as an AppImage should.
If you are on 0.2.9, download this release by hand — the in-app updater on 0.2.9 cannot reach GitHub for the same reason.