deleting storageclasses on tilt down

[nicks]

A user asked:

Is there a recommended way to not delete certain helm resources on a tilt down, such as a storageclass?

StorageClass is a cluster-wide resource for configuring a type of storage.

To me, it's similar to a namespace, which we had a similar discussion about:
#3160
#2805

Should we treat StorageClasses the same way, and only delete them if you pass a special flag?

I really admire the Helm solution to this:
https://helm.sh/docs/topics/charts_hooks/

where you can add annotations to a resource like:

    "helm.sh/hook": post-install
    "helm.sh/hook-weight": "-5"
    "helm.sh/hook-delete-policy": hook-succeeded

to specify what helm should do with a resource at different stages of the lifecycle. So you could imagine a Tilt annotation like:

  "tilt.dev/down-policy": keep

[nicks]

You can currently work around this with something like:

yaml = ...
if config.tilt_subcommand == 'down':
  filtered, yaml = filter_yaml(yaml, kind='StorageClass')
k8s_yaml(yaml)

but that feels very imperative rather than the delarative style we'd rather encourage