Add testing of Zarr development branch

[Carreau]

Only on linux and a single version of Python.

This would help to catch potential regressions.

[joshmoore]

Thanks, @Carreau. Happy to have this in. Also, good to see another working version after the fun of gh-51. Depending on what happens with build.yml, I may refactor this into the existing workflow and use another build dimension for different zarr versions.

[Carreau]

I may refactor this into the existing workflow and use another build dimension for different zarr versions.

I thought about doing this but I believed that testing on only ome zarr version and only linux was sufficient, which would be annoying with adding a dimension.

[joshmoore]

We'll see ;) We also have a build that switches to a French Locale once a week to help detect bugs.