COVID-19 tests of both the production staff and the hotel staff are conducted on a regular basis.
According to the story from THR where the images came from, it’s already cost something in the neighborhood of $3 million for the film to keep everybody tested.
The Jurassic World: Dominion production has built a bubble for themselves by renting out an entire hotel where the production team is staying while filming is underway.
This certainly wasn’t money in the original budget but it seems clear that Universal understands this is now the cost of doing business.