Soaker hose off the mains water or your own harvesting?
I lay soaker hose/perforated land pipe as backup but ideally i like to get to the point where i water very little if at all, something easier to aim for here in the south of England than for many others (yes, it rains a lot)
If your beds ran tight to inside of the hoophouse, do you think a swale around the outside would feed into the beds? I suppose really its would be like a French drain, so would help clear thr water from the foot of the structure (less mud and puddles)