Hyphen at the end of usernames

[madic-creates]

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Hello GitHub Support Team,

at the moment, GitHub allows hyphens at the end of a username. The username also gets used as hostname part for GitHub pages.

In my case, this leads to the FQDN madic-.github.io

The problem is, that hyphens aren't allowed at the end of the hostname part in DNS. Firefox shows a certificate error, even though the certificate may be correct. It's working in chromium based browsers. Seems they ignore that. Example from my own GitHub pages: https://madic-.github.io/k3s-git-ops/

Also, some DNS resolver don't even resolve such FQDNs.

Maybe for future accounts, GitHub should forbid hyphens at the end?

[github-actions[bot]]

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[madic-creates]

Tagging container images, and though uploading them, is also not possible...

Error: buildx failed with: ERROR: invalid tag "ghcr.io/madic-/vagrant-libvirt-ansible:latest": invalid reference format

It would be great for future users to not allow a hyphen at the end of a username...