How to participate in the Early Access for Linux systems?

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I've read that ARMA 3 has now Early Access option for Linux systems. As I'm keen on playing this simulation FPS, I would like to know how to get access to it.
On the Steam stores I only can see the Windows logo for supported systems. Now I don't want to buy it just to get disappointed or find out that this wouldn't be the right way.
How can I get Early Access to ARMA 3 for Linux systems?
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Linux FILES location and ACCESS option on WSL 2 | Windows 11/10
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