Do you think it is ethical to work for a company that builds drones, weaponry, or supplies parts to the military?

My opinion is threefold:

1. It is always ethical to not starve to death. (Caveat: assuming you are not directly harming someone else) If the only job available to you is making supplies for the military, don't beat yourself up. We live in a capitalist hellscape, you need to pay rent, you need to buy food, you need health insurance, you need to be able to have vacations and save for retirement and do fun things from time to time. If you can do anything to mitigate that harm--participate in demonstrations, donate to aid organizations, etc--do that; but if you're not in a situation to be able to do those things, you're not being unethical. You're just doing what you can.
2. It is always ethical to do less harm. If your company makes support equipment for military applications--desk chairs, for example, or toilet paper--your job is more ethical than the job making, you know, bombs or bullets or napalm or whatever. A job making things that are not inherently harmful but can be used in the course of causing harm-- well, let's be honest, that's every job.
3. A job in military supply is as ethical as the company you work for and the military they sell to. If your company is selling smart bombs to Russia's military, try to get out. But if your company is selling to a military that uses the products of your labor to mount a defense against an invading force, what you're doing might even be helping to reduce death.

But overall, "ethicalness" is not a binary, and it's not the same in every situation.