Cleaning up old nightly conda packages

[jakirkham]

Having support for dask nightlies has been wonderful from a development standpoint

Recently we noticed that we are getting quite a lot of them tracking back over the years (back to 2021!)

As a result this means there are a lot of packages in the dask channel

This can make the channel repodata get quite large (and unfortunately a bit unwieldy)

So am wondering if we can clean this up a bit. Namely would it be reasonable to remove all nightlies after making a release?

Presumably users only care about nightlies newer than the last release. So dropping the old nightlies shouldn't matter much. Perhaps we can do this in an automated GHA script when a git tag is detected

Would be interested to hear thoughts on this 🙂