Spray the calipers and disc pads as much as you can see with brake cleaner.
Then rock the front wheel back & forth with your hand untill it moves.
Later remove the pads and clean up.
Gentle rub disc surface with a rubbing pad.
As long as you keep the Disc surface and pad surface clean and dry that should be ok.
It's the damp that causes the problems.
R
Ps. To stop it happening again, push back the pads just a little, so there is no contact with the disc, or
remove the pads altogether. Lump of wood under frt brake lever to stop pulling it on.
Don't forget to put them back in before you ride it!