my first thoughts about what to plant are greens of all kinds- lettuce, arugula, spinach, mizuna.....chard, and brassicas- broccoli, kale, and cabbage/etc because they are ok in cold, have shallow roots and dont take much nutrients or fussing to grow and produce food almost immediately....and then keep producing abundantly for your little effort....
these all do ok in containers too, even smaller pots. maybe start off with a garden that is for salads...start the greens and then start adding things you would want in a salad alongside it...some edible peas....maybe some carrots, beets if you like them....nasturtiums are interesting edibles, but they like lots of water......within a few weeks you should be able to start harvesting at least some food. these are just plants i like, you should obviously figure out what you want to eat and like and if and how to grow it in your climate.
i like the rubbermaid idea, i have a couple of containers just like that from some free plastic tubs i manifested. its not the most aesthetically pleasing but it actually works great. i ran out of room for potatoes so i starting filling a couple of those up...the potatoes in there actually do a LOT better than the big potato beds i have in the ground.
and yeah this is a bit off to the side of "permaculture" or food forest, that just takes a lot of time in one place...but i personally wouldnt let it stop you ...i havent let it stop me from planting long term gardens in places where i thought i wouldnt be long term....i suppose you need to choose plants that have a good chance of self perpetuating. and be the rare kind of soul who is willing to plant a bunch of stuff they might not get to eat, but just for the land and wild creatures, or future humans. perhaps start some nut trees that like your climate, these wouldd be popular wildlife foods later on....or you could move some of them to your next place.
look for self seeders, or hardy
perennial plants that can grow without human input, things that grow like weeds and are useful/edible...then hope that you can get them going well
enough to continue to self perpetuate even after you leave.
some examples off the top of my head- red clover, chammomile, any mallow/hollyhock/hibiscus, borage, strawberries/any berry, thimbleberry or any ribes/rubus- currants and such...miners lettuce, any arugula, even kale...i have seen kale naturalize itself and self seed....growing like a wild kale tree =) at least here where its warmer. and maybe you wont get to enjoy harvesting all of it before you leave, but if youre ok with just doing it anyway, just go for it and see what happens.
potatoes, garlic, and onions are all really easy and do ok in colder areas...but they do take the better part of a year to finish up. in the meantime though you can pull them up and eat them immature, or at least i do sometimes, plus eat the chives from the onions/garlic/leeks. egyptian walking onions are very cool, and have a shot of continuing for a long time after you left for whoever else later on.....
another obvious thought is to go about in the woods where the cabin is and find out about the local plants that grow there that are useful and edibles....take cuttings and gather seeds when you can and grow them.... move them close to your spot.
you might also look into making some hotbeds, with straw...or especially with
straw bales. you dont have to use straw bales to get the hotbed effect, but its a good idea and raises them up higher.....just using tons of straw, maybe manure if you have some available, makes the bed hot....as the straw decomposes it heats up from the inside of the soil. maybe thats a little less stealth style, but perhaps with some larger containers, like big found wooden boxes or crates or something you make...you could fill them with a lot of straw and a little manure for this effect and then top it off with some kind of bag soil.