Release docker images to github packages (ghcr.io)

[lmsurpre]

Is your feature request related to a problem? Please describe. For IBM FHIR Server, we pushed our docker images to DockerHub under the organization ibmcom.

The LinuxForHealth project has its own organization on DockerHub at https://hub.docker.com/u/linuxforhealth. However, DockerHub has some rather significant limitations for us and alternative image hosting is readily available.

I discussed it with @dixonwhitmire and we decided to use the GitHub Container Registry for our images going forward. This will mean a longer image path (ghcr.io/linuxforhealth/fhir-server instead of just linuxforhealth/fhir-server) but we think its still reasonable.

Describe the solution you'd like Update our automation

Question: Will github packages let us update an image thats already been pushed. We do that today to ensure that the base OS stays up-to-date with security fixes. I assume it will allow that since its pretty common practice.

Describe alternatives you've considered Continue pushing to DockerHub (under linuxforhealth)

Acceptance Criteria

1. GIVEN [a precondition] AND [another precondition] WHEN [test step] AND [test step] THEN [verification step] AND [verification step]

Additional context At least two workflows need updating:

• release.yml
• rebuild.yml