Sunshine on Steam Deck as flatpak?

[mgrumpeli]

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Bug

Body

I installed sunshine flatpak system level from flathub on my Steam Deck: flatpak install --system flathub dev.lizardbyte.app.Sunshine

Issues:

KMS capture
sudo -i PULSE_SERVER=unix:/run/user/$(id -u $whoami)/pulse/native flatpak run dev.lizardbyte.app.Sunshine
After pasting this to console, there is an error saying
(deck@steamdeck ~)$ sudo -i PULSE_SERVER=unix:/run/user/$(id -u $whoami)/pulse/native flatpak run dev.lizardbyte.app.Sunshine
F: Not sharing "/dev/dri" with sandbox: Path "/dev" is reserved by Flatpak
error: XDG_RUNTIME_DIR is invalid or not set in the environment.
F: X11 socket /tmp/.X11-unix/X0 does not exist in filesystem, trying to use abstract socket instead.
bwrap: Can't find source path /run/user/1000/pulse/native: Permission denied

Encoder
Error messages:
Fatal: Unable to find display or encoder during startup.
Fatal: Please check that a display is connected and powered on.

Anyone got experience with Sunshine on Steamdeck?
Or someone can show me a previous discussion about it?

[ReenigneArcher]

Did you solve it? Can you post your solution for others who may have the same issue?