Add Sunshine to appimage.github.io #151

Describe the Bug

Following the next release of Sunshine; let's add Sunshine to AppImage hub. AppImage/appimage.github.io#2881

Expected Behavior

No response

Additional Context

This will require that the sunshine.AppImage be distributed as a single file instead of an archive. See here: AppImage/appimage.github.io#2881 (comment)

Initially ran into issues attempting to do this with the paths, potentially code changes will be required in sunshine, see here: linuxdeploy/linuxdeploy#201

AppImage suggests that the binary needs to find files relative to itself, which I don't believe is the case, and probably part of the problem. See here: https://docs.appimage.org/packaging-guide/from-source/native-binaries.html?highlight=relative%20path#packaging-existing-binaries-or-manually-packaging-everything

A possible solution is to create a custom AppRun file that takes care of copying files out of the AppImage to the expected locations. I'm thinking this could also setup the udev rules. The AppRun can be any type of executable or even a symlink. I'm thinking a bash script would make the most sense.

Another potential solution is to use pkg2AppImage which can patch the sunshine binary, I don't know if it will work in our case. See here: https://docs.appimage.org/packaging-guide/converting-binary-packages/pkg2appimage.html?highlight=apprun#keys-that-enable-ability-to-relocate

Sunshine Host Operating System and Version

Linux

Architecture

Sunshine Version

GPU Type

GPU Model

GPU Driver/Mesa Version

Capture Method (Linux Only)