Feature Request: Provide Linux distribution formats (Flatpak / AppImage)

[cuervolu]

Is your feature request related to a problem? Please describe.
Currently, Linux users primarily have access to a .deb package in the releases. While this is helpful for Debian/Ubuntu-based distributions, it leaves out a significant portion of the Linux ecosystem (Fedora, Arch, OpenSUSE, etc.).

For an application that aims to be a "Store," the absence of a universal, native-feeling distribution format creates friction. Users on non-Debian systems must manually manage the execution of binaries or JARs, which lacks system menu integration and automatic updates.

I've noticed that there is already some ongoing discussion regarding AppImage support in issues #161 and #162, which is a great step forward for portability.

Describe the solution you'd like
I would like to see official support for universal Linux distribution formats, specifically Flatpak (ideally published on Flathub) to complement the AppImage efforts and reach all distributions.

Since this is a Kotlin Multiplatform project, a great reference for distributing a Compose Multiplatform app on Linux is FeedFlow:

• FeedFlow on Flathub: https://flathub.org/en/apps/com.prof18.feedflow
• FeedFlow Repository (for build scripts): https://github.com/prof18/feedflow

Describe alternatives you've considered

• Current .deb package: Only works for a specific subset of Linux users.
• Manual Binary Execution: Lacks desktop integration (icons, launcher).
• Native Packages (RPM/Arch): Too much maintenance overhead compared to a single Flatpak/AppImage.

Additional context
Given that GitHub Store functions as an installer/manager for other binaries, the Flatpak Sandbox presents a unique challenge:

1. Permissions: The app would require specific permissions (e.g., filesystem=home or filesystem=host) to manage and execute binaries on the host system.
2. Why Flatpak anyway? It ensures the exact JRE/JBR required is bundled, avoiding rendering issues across different distros, and provides a centralized update stream.

I would be more than happy to help test or troubleshoot any Linux-specific issues during the implementation of these formats.

[shuvashish76]

Duplicate of #38

[cuervolu]

@shuvashish76

While issue #38 specifically addresses AppImage (which is great for portability), this request is focused on Flatpak/Flathub support.

These are distinct distribution methods:

• AppImage: Portable, "download and run", manual updates (unless using external tools).
• Flatpak: Centralized distribution (Flathub), system integration, atomic updates, and sandboxing.

Given that Github Store is a store/manager itself, having it on Flathub (like the referenced FeedFlow example) provides a more "native store" experience for Linux users compared to a portable executable.

I believe keeping this open to track Flatpak specifically is valuable, even if AppImage is solved in #38.

[rainxchzed]

Hey @cuervolu Thanks for suggestion! I am already on my way to do it #168