Build linux-unpacked dir in build:steam script
Add Linux depot (4475443) to upload2steam, env-var overridable
electron-builder: Linux target, .desktop Categories, synopsis
Disable sandbox on Linux packaged builds (SUID not set in dist)
Auto-fullscreen on Steam Deck (SteamDeck=1 / SteamOS=1 env)
Fall back to keyboard input when no camera detected (e.g. Deck)
Add Linux/Steam Deck Support
Source: Steam Community (opens in a new tab)