[BUG] Browser not launching on bazzite

[dqhoang]

Describe the bug
Attempting to run the 0.2.1 beta appimage on Bazzite (fedora linux). The "Sign in with your browser" link does not launch firefox (default browser), and no manual url is given to authenticate.

Without this, I cannot log into the application.

To Reproduce
Steps to reproduce the behavior:

1. Download 0.2.1 amd64 appimage
2. Launch the appimage
3. Enter host host information (https://drop.local.host)
4. Click "Sign in with your browser"
5. Observe no browser is launched, and no manual url to authenticate

Expected behavior
Browser is launch, and alternate authentication method is provided (form login, "or copy this url to your browser", etc)

Desktop (please complete the following information):

• OS: Bazzite (fedora)
• App Version: 0.2.1

Additional context
Attempted to run latest v0.3 beta, nothing happens

[DecDuck]

This is probably because it's running in a Flatpak. We're going to implement code-based authorisations for this use case, probably coming in 0.3

[DecDuck]

This will not be coming in 0.3.0, but it is implemented, waiting on merge. #83

[DecDuck]

In v0.3.1