I don’t think you’ll be asked but, if you are, simply say:
“Vaccination? I ain’t got no vaccination. I don’t need no vaccination! I don’t have to show you any stinkin’ vaccination card!”
Just kidding… you won’t be asked, IMHO.
My son will be starting a job on Monday. He was just asked by his new employer if he was fully vaccinated. He responded that he preferred to wear a mask.