mean he can run it without any kind of graphics? Then what can he do? Nothing?
Well, the DOOM simulation code is divorced from rendering and other aspects, so you can run the whole game logic, which would update the state frame by frame. The rendering aspect simply reads this game state and renders the relevant graphics for it. Running DOOM on GitHub Actions means running its simulation part which would still play the game in the technical sense.
Let's take a look at your baby, shall we? *DOOM music kicking in*
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