[Feature request]Plesae make kubelogin available as a devcontainer feature

It would be great if kubelogin were installable as a devcontainer feature: https://containers.dev/features?search=kubelogin

Right now I'm having to run these commands as part of a postCreateCommand script

```shell
asdf plugin add kubelogin
asdf install kubelogin 0.1.4
asdf global kubelogin 0.1.4
```

It would be nice if I didn't have to.

(And P.S. We're pinning to 0.1.4 because we had issues with later versions, specifically 0.2.10. Something to do with storing tokens locally. I'm not certain what the problem is but I know we don't have it in 0.1.4)

Start with the containers.dev feature search linked in the issue and compare it with the existing postCreateCommand steps: asdf plugin add kubelogin, asdf install kubelogin 0.1.4, and asdf global kubelogin 0.1.4. Done means kubelogin can be installed as a devcontainer feature, including the version behavior needed for the reported 0.1.4 use case, without those commands.

Written by the indexing model from the issue text.