Consider publishing containers to ghcr.io via GitHub Actions

[aj-stein-gsa]

@Cybonto per our discussion today and common build issues for consuming developer-user types who are not going to add, change, or remove the core software, it may be worth considering the publication of container images up to ghcr.io for others to use in operating the software and writing pipelines to reduce burden on building the images and securing the pipeline to speak.

Reference info per our discussion earlier today for how other FedRAMP projects do this. We build "one image" without docker/podman compose but it should be very possible to adjust this approach with some inspiration from a sister project. See the example below.

https://github.com/GSA/fedramp-automation/blob/478908eed8e6d077f7d5cc94e8b7d7b7fa1fca2f/.github/workflows/content-artifacts.yml#L70-L131