Looking at their FAQ, that’s just for the machine, the disk and IP look to be about 1 Euro each per month, so I assume the total would be 5 Euros plus VAT (somewhere just a bit more than $6 USD), but that sounds doable I think?
I’m assuming everything is still under docker trickery, so that’s probably no big deal (I assume) from the other guy’s “shove files here, open browser here” method, right?