[FEATURE] Provide official Linux AppImage builds (x86_64 + aarch64)

[newyorkthink]

Title
[FEATURE] Provide official Linux AppImage builds (x86_64 + aarch64)

Body (copy/paste into the issue description)

Feature Summary

Please provide official Linux AppImage packages for this project, published alongside existing releases (e.g., on GitHub Releases). A single self-contained AppImage would make installation and updates significantly easier across a wide range of Linux distributions.

Problem / Use Case

Right now, installing the desktop app on Linux can be difficult depending on the distro (packaging formats, dependencies, sandboxing quirks, missing repos, etc.). Many users want a “download → run” option that works on:

• Arch / Manjaro
• Debian / Ubuntu / Mint
• Fedora / RHEL-based distros
• NixOS (often still usable with AppImage + workarounds)
• Minimal systems where Flatpak/Snap aren’t preferred or available

AppImage is a common, distro-agnostic format that reduces support burden and makes onboarding easier.

Proposed Solution

Add CI packaging for AppImage and publish artifacts for each stable release:

• AppName-x86_64.AppImage
• AppName-aarch64.AppImage (if feasible)

Suggested requirements:

• Built in CI (GitHub Actions)
• Uploaded to GitHub Releases automatically on tags
• Provide checksums (SHA256SUMS) and optionally GPG signatures
• Include .desktop + icon integration where appropriate
• Prefer stable runtime compatibility (e.g., build on an older glibc baseline or use recommended AppImage tooling)

Current Workaround

Users currently have to rely on:

• Building from source
• Distro-specific packaging (if any)
• Manual dependency troubleshooting / repackaging

These workarounds increase friction and lead to repeated support requests.

Detailed Description

User Interface

No UI changes needed. This is purely a distribution/packaging improvement.

Integration Points

Would integrate with:

• GitHub Actions CI
• GitHub Releases

Additional Notes / Acceptance Criteria

• Downloading the AppImage from Releases should work on common distros without extra steps.
• The AppImage should run without requiring users to install additional libraries beyond typical base system components.
• If sandboxing is relevant (e.g., Electron), document any required flags or portal dependencies.

Thanks! Having an official AppImage would greatly improve the Linux installation experience and reduce packaging fragmentation.

[BinaryMuse]

Thanks for the issue! I can respond in more detail another time, but just quickly: we did originally ship .AppImage files for Atuin Desktop, but we found they had issues. #109 is related. It's not something we're ideologically against — we'd love for Desktop to be as simple to setup as possible — but we'd need to solve the related issues.

[MichaelRogsys]

I will be overally honest and comment that Atuin Desktop does not function in Linux regardless of the method of packaging.