Add cd workflow and post initial package

[jeromekelleher]

I think we can post an initial 0.0.1 package to pypi to make this easier to try out/squat on the name.

Hopefully we can copy the cd workflow from bio2zarr and plug in to that?

Although it might be easier if I set up the initial pypi package first manually, and then we get the cd workflow going for subsequent releases?

[jeromekelleher]

Ready to go, let's ship it!

[jeromekelleher]

I've tagged an initial package 0.0.1a1 but had some problems with the CD here. Looks like something to do with tokens?

[benjeffery]

The actual error is
Can't have direct dependency: bio2zarr@git+https://github.com/sgkit-dev/bio2zarr.git ; extra == "dev". See https://packaging.python.org/specifications/core-metadata for more information.

[tomwhite]

So we should change to depend on a released bio2zarr. I've just realised that bio2zarr has a direct (github) dependency on hypothesis-vcf, which doesn't have any releases. So I think I need to release that first to unblock a release of bio2zarr then vcztools. I'll do a hypothesis-vcf release later in the week.

[jeromekelleher]

What's the bio2zarr dependency for here? Would be nice to keep these separated, or perhaps make the dependency go the other direction? (I can imagine vcztools forming a useful place to keep core functionality useful across the ecosystem, e.g. efficient iteration over variants as discussed in #112).

[benjeffery]

I think it can be removed as a dependency as currently it is in [project.optional-dependencies] and the only references in the repo are in tests. Suggest moving dev deps to a separate requirements file that isn't inspected by PyPI.

[jeromekelleher]

Well it's nice having all the deps in one place all right, it does get messy have loads of requirements files. I'm guessing we just need to ship a version of bio2zarr, so then the dev deps can be one something released.

[tomwhite]

The bio2zarr dependency is just for testing, which I think is correct.

I've now released hypothesis-vcf to PyPI, and created a PR to use it in bio2zarr.

Then (next week?) we can release bio2zarr, and then vcztools after that.