Push images to quay.io

[chrisdoherty4]

Tinkerbell projects push their Docker images to quay.io. CAPT doesn't currently have a repository in quay.io (admins to create). Having done that, the release process needs twiddling to push the images accordingly.

[displague]

http://quay.io/tinkerbell/cluster-api-provider-tinkerbell has been created with Quay access rights matching Rufio. The GH organization has provides QUAY credentials, so GH actions should just work.