new dtree file in zarr format

[aladinor]

Hi everyone,

I want to add a new radar datatree file in Zarr format. It has multiple folders and subfolders. Should I add it as a compressed (bz, tar, ...) file? I ask this because in [#52], I noticed that every folder and subfolder within the Zarr file will create a new registry entry. Around 150 entries will be added to the registry.txt file.

Let me know your thoughts

[kmuehlbauer]

@aladinor Yes, please use a compressed representation. We already have some files gzipped, so maybe just use gzip (eg. .tar.gz)? We can extract the folder before usage in CI using context manager.

[aladinor]

Closed with #54