[Tenshock]

Summary

This PR adds reproducible Nix packaging for Tchap Desktop.

Instead of building the repository’s Tauri application, it packages Tchap Web inside nixpkgs’ element-desktop Electron shell. This follows the strategy discussed in #161 and avoids current Linux WebView limitations, notably incomplete WebRTC support.

Packaging choices

The package:

• Uses Tchap Web 4.21.5 and its production archive
• Reuses the pinned nixpkgs element-desktop derivation
• Disables self-updates with --no-update
• Uses gnome-libsecret for password storage on Linux
• Applies Tchap branding, icons and application identifiers
• Registers tchap:// links and preserves %u URL forwarding
• Installs Tchap.app with its packaged web application on Darwin

Updates remain declarative: new releases require updating the version, archive name and fixed-output hash.

Supported flake systems are:

• x86_64-linux
• aarch64-linux
• aarch64-darwin

x86_64-darwin is omitted because the pinned element-desktop package does not support it.

Verification

All packages and smoke checks evaluate successfully:

nix flake check --all-systems --no-build

The native x86_64-linux package builds successfully:

nix build .#tchap-desktop --no-link

The Linux smoke check validates the executable, web application, icon, desktop entry, deep-link registration and wrapper arguments. It also starts the application under Xvfb and an isolated D-Bus session to detect immediate startup failures.

Repository validation also passes:

git diff --check

Limitations

The following remain untested:

• Native aarch64-linux build and runtime
• Native aarch64-darwin build and runtime
• End-to-end tchap:// handling
• macOS launching and signing

[Tenshock]

@jdauphant-dinum, any thoughts on this?

[jdauphant-dinum]

@jdauphant-dinum, any thoughts on this?

Sorry @Tenshock for the late reply, I just saw your PR, we will take a look.
Ping @plegrand-dinum @rlahfa-dinum @fvo-dinum

[jdauphant-dinum]

We are still discussing internally on the best way to do it.
We keep you updated.

[Tenshock]

Thanks for the update. I understand that packaging Tauri would be much more relevant, it's ok if this PR never lands.