Github Actions Build Packages and Deploy tests (conda and PyPi)

[valeriupredoi]

Added conda and PyPi package builds and deployment:

• PyPi builds correctly, see here - untested upload to Test PyPi and PyPi, we'll test with release_2.1 branch
• conda builds correctly (no verify) here - untested upload to Anaconda cloud with --label test, we'll test with release_2.1 branch

[bouweandela]

Looks good! Did you provide GitHub with the required ANACONDA_TOKEN, test_pypi_password, and pypi_password already?

[stefsmeets]

Consider using slightly more descriptive job names

Suggested change

	publish:
	deploy_to_conda:

[valeriupredoi]

cheers @stefsmeets - no need to since the job appears as Anaconda Publish/publish - ideally we'd want shorter names so they don't get truncated in the browser dashboard

[stefsmeets]

Suggested change

	build-n-publish:
	deploy_to_pypi:

[valeriupredoi]

same here 👍

[stefsmeets]

We support python3.6+, so should we build with 3.6?

[valeriupredoi]

the actual build and deployment is always done with the latest supported Python, so no need to test with other older versions 👍

[valeriupredoi]

also - that would mean we'd have to release three different packages _py36.., _py37, _py38... - we could do that but I reckon it's too much since we'd confuse the users even more 😁 ...

[bouweandela]

Merging this now, because we need it for the release today. If there's any remaining work to do, it can be done in a new pull request.