Authenticate against ghcr.io
Authenticate against ghcr.io

This change adds a login step that authenticates the runner to
ghcr.io. This allows whomever triggers the action to use github
packages as a destination for the container images.

Signed-off-by: Gabriel Adrian Samfira <b9b7bdd75199335be816b689ced5efab6b49f415@cloudbasesolutions.com>

containerd/containerd,estesp/containerd,dmcgowan/containerd,dmcgowan/containerd,thaJeztah/containerd,thaJeztah/containerd,mikebrow/containerd,containerd/containerd,mikebrow/containerd,estesp/containerd