Version

redhat-actions/push-to-registry@v2

Describe the bug

If a user has uppercase letters in their github username they will get a transport error when uploading containers to ghcr

A copy of the error occurs here
https://github.com/TrevorDecker/push-to-registry/runs/7242515507?check_suite_focus=true#step:5:57

changing

IMAGE_REGISTRY: ghcr.io/${{ github.repository_owner }} to IMAGE_REGISTRY: ghcr.io/trevordecker fixes the problem

Steps to reproduce, workflow links, screenshots