[Bug]: Container names allowed with illegal characters

[dcarlson-MIE]

Current URL

https://manager.os.mieweb.org/sites/1/containers/new

Username

No response

Version

No response

Steps to reproduce

1. Go to https://manager.os.mieweb.org/sites/1/containers/new
2. Type a container name with an underscore
3. It lets you, but it fails on setup

We need to not allow illegal characters.

Expected behavior

Box should have set up correctly.

Actual behavior

Box failed to set up

Additional context

No response