That was easy!
- podman pull ghcr.io/some-natalie/jekyll-in-a-can
- podman login myforge.mydomain.tld
- podman push ghcr.io/some-natalie/jekyll-in-a-can myforge.mydomain.tld/webhosting/jekyll-in-a-can:latest
and now I can use myforge.mydomain.tld/webhosting/jekyll-in-a-can:latest in my Forgejo Action script to use the locally stored container image :)
TL;DR Forgejo offers an integrated OCI compliant container registry to provide container images!

