Superpowered bootstrap containers

**What I'd like:**

I would like superpowered bootstrap containers for initialization.

**Any alternatives you've considered:**

Instead, I run the container as a host container, run the initialization code, then

```sh
apiclient set host-containers.example.enabled=false
```

This has multiple downsides: (1) I need to include apiclient in the host container and (2) I can't interrupt the boot on error.

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While there are security concerns with superpowered containers, these concerns are not any higher for bootstrap containers than host containers.