At one point I think there was a website which when provided with an mkv file allow you to watch the movie and make the decisions. Not sure if it is still around or what it was called

It just appeared in my recommended again so I suspect you are correct

What’s next? A burger time movie

When I saw this in theatres I was convinced they put the wrong movie on by mistake

I feel like how much you like this movie depends on how much you value and relate to the references. Like basically every movie based on a video game (especially something as open ended as Minecraft) the plot on its own is severely lacking. All of these movies rely on the familiarly aspect and like those this movie was successful in that. I was honestly surprised they did not shove more references in given how easy it would have been and the fact that they did not even mention the end makes me think they have a 2nd and 3rd movie in mind.

Also if you do go this route and are concerned about privacy and security you can get a cheap vps then setup a VPN (wireguard probably) on the vps and have your home server connect to that. Then you can forward the vps ports to the VPN IP of your home server. This means that you don’t need to have port forwarding or even a dedicated IP at home and users don’t get your home IP. Keep in mind you need a vps that is relatively close to your house to keep the latency down as this setup will add twice the latency between home and the vps to the connection.

Just an FYI getting a vps or dedicated server that is fast enough for Minecraft modpacks is going to be fairly expensive. It might be cheaper to get shared hosting for the MC server and a separate vps for the docker stuff.