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Sure, you can grow these in container. These two articles will help:

https://www.gardeningknowhow.com/edible/herbs/garlic/growing-garlic-in-containers.htm

https://www.gardeningknowhow.com/edible/vegetables/onion/growing-onions-in-container-gardens.htm

I have answered this on the original question, as this is a duplicate.

An article on this website suggests the following: "If you are growing ramps using transplanting, plant bulbs in February or March (as soon as the soil has thawed). Set bulbs 3 inches deep and 4-6 inches apart. Water and mulch the bed with 2-3 inches of composted leaves."
They require a moist, shaded growing area and will take 3-5 years to reach harvesting size if you want a perennial patch. Unlike scallions, these can't be harvested quickly as it will effectively kill the plant. You might find this article helpful: https://modernfarmer.com/2016/09/ramps/

Read more at Gardening Know How: Uses For Ramps: How To Grow Wild Leek Ramps In The Garden https://www.gardeningknowhow.com/edible/vegetables/ramps/grow-wild-leek-ramps.htm

Bring the allium up to a sunny window, preferably south facing. Water them but don't fertilize yet. There are many types of allium, some spring bloomers and some summer. If you have a summer blooming allium, I would not plant it out in the garden until after your frost free date. Otherwise, start the process of hardening them off so you can plant them soon. When they are in the garden and have started to grow, then you can fertilize them if you wish. Fertilizing too early doesn't give the plant the necessary time to establish a good root system so it can sustain new growth. Below are links to articles on hardening off and allium care.
https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/how-to-harden-off-your-seedlings.htm
https://www.gardeningknowhow.com/ornamental/bulbs/allium/growing-alliums.htm
If your allium sends up a flower spike before you plant it, delay planting until after blooming is over.

Yes. here is info on forcing bulbs.

https://www.gardeningknowhow.com/ornamental/bulbs/bgen/chilling-flowering-bulbs.htm

https://www.gardeningknowhow.com/ornamental/bulbs/allium/allium-post-bloom-care.htm

It is likely that a seed has fallen into the bed. Likely from a bird or rodent. Onions and Bluebell are too far removed from one another on the evolutionary scale to hybridize.

Luckily, onions reproduce by division and by seed, so you will have plenty of opportunity to divide them.

Here is an article for the care of flowering Alliums:

https://www.gardeningknowhow.com/ornamental/bulbs/allium/growing-alliums.htm