Create nightly, dev, and stable build channels

[carreter]

Describe the desired feature/enhancement

Set up a CI/CD system that is triggered:

• every night to release a nightly build based on main
• on merge into release-dev to release a dev build
• on merge into release-stable to release a stable build

Is your feature request related to a problem?

Would simplify the release workflow and allow users to choose between different levels of stability/new features tradeoffs.

Describe the solution you'd like

Ideally this will be done using a new CI/CD system as suggested in #365, which for now means this issue is blocked by #365.

Describe alternatives you've considered (optional)

Additional context

@TimothyStiles suggested this and I really like this idea!

[carreter]

Nightly builds were introduced by #429. We won't be doing dev and stable build channels for now, as we are too early in the development cycle to see much of an advantage.