[Feature request] Prevent users to submit names that are not valid kubernetes names

[fungiboletus]

Kubernetes is relatively strict about the names of its resources, as it should be valid DNS names.

The frontend doesn't prevent submitting invalid names. Kubernetes will reject them, but it could be preferable to do little validation on the frontend first. Like using the pattern parameters in <input> tags, or a bit more advanced javascript. Svelte must have some neat validation library.

To reproduce: create a run with two words and a space between them as name.