Strawberries usually overwinter outdoors in the ground (so the roots are insulated), and in those conditions can retain some foliage over the winter. In a dark location such as a garage (even if there are windows, it's not enough natural light), leaf shed would be expected, though overlapping conditions contributing to leaf drop like over- or under-watering or a fungal infection are also possible that we can't rule out. It's hard to tell from the photo what is affecting the plant, but if you don't have the ability to overwinter it outdoors (ideally in a way that shelters the roots from temperature extremes while being able to monitor it for watering needs, such as by keeping it against a south- or west-facing wall that is warmed by the sun, by planting the strawberries, or by piling mulch or soil around the pot to give it more volume to slow down freezing) then just trim off any dead/dying leaves and only water the pot when the soil has become somewhat dry about an inch or two deep into the pot. Empty the saucer after watering so the pot doesn't sit in the collected water and soak that extra water back into the root ball, which could stress or kill roots.

Miri

Daily checking, at least at first so you can get used to its drying pattern in colder weather and dormancy, would be a good idea, yes. It's a comparatively small soil volume for that many plants, especially as they mature and expand their root growth, though we acknowledge that it's what this pot style is designed to hold. If the pot is unglazed terra cotta, it may be wicking moisture out of the soil faster than evaporation alone would do for a plastic pot. (Dry winter air from low ambient humidity - when it's not raining, at least - is contributing to that.) Don't rely on the pipe alone to deliver water evenly (though you can still use it); water the soil at the top of the pot around the pipe as well, so it soaks all the way through the soil layers/depth.

Miri