Push Paketo Buildpacks to CNB registry

[kvedurmu]

We should look into publishing all meta/implementation Paketo buildpacks to the CNB registry, now that it's been implemented as per this RFC.

This would involve running pack register-buildpack or using leveraging existing github actions everytime a new buildpack is published to GCR/Dockerhub. Ultimately, publishing all buildpacks to the CNB registry will make it easier for users to "discover" buildpacks that exist.

[kvedurmu]

cc @sophiewigmore this just duplicates paketo-buildpacks/github-config#204.

I'm wondering if the github discussions feature gives us a good way to surface project-wide requests such as this.

[sophiewigmore]

This idea was implemented in: paketo-buildpacks/github-config#222!
Any buildpack that has a release cut now will be pushed to the CNB registry