Ok so far it breaks down to the following:
1 gal pots containers
hot peppers
herbs
lettuces
4 gal pots/containers
Bush type cukes. Other cucurbits (eg, melons, cukes, squash) might be a bit of a stretch because they tend to like a lot of water and support could also be a problem unless you just let them sprawl.
Garlic and bunching onions - should work if the needs of the plants are met and spacing in the container is sufficient. Don't overcrowd with garlic (unless you are just trying to grow some green garlic / for the tops) or bulb development could be affected.
Bulb onions and other root crops you mentioned - might be worth a go if the depth of the container is sufficient to allow proper development of the root (crop).
root crops:
beets
turnips
rutabaga
OK what about these?
peppers - sweet and hot
carrots - little fingers, thumbilina and reg long types
collards
mustards
leeks
swiss chard
eggplants
pak choi
spinach round leaf
kohl rabi
sweet snow peas
luffa gourd
cabbage
okra
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