What's the process to add new images?

I assume this is limited to CVEs in the underlying layers, and adding in the latest of the primary package. Given that how/are you testing the images after you fix the CVEs?

Adding images involves us creating a new package (APK) in our APK repo. This is done by creating a melange build config (https://github.com/chainguard-dev/melange). The melange config defines some basic tests. It's not comprehensive, but generally validates that the binary produced is functional.

When we build the OCI image, we validate it via some custom tests that we've written. We have identified the canonical image (i.e. DockerHub, GHCR, etc), and we confirm that our image has the same entrypoint, args, env that the canonical image has. Then we have some generated scenarios we run the OCI image through to make sure it functions the same as the canonical image runs.

For example, we have Postgres in the catalog today. When we rebuild, we have some tests that run with various configurations of PG_DATABASE/PG_PASSWORD, etc env vars. We run these with our image and with index.docker.io/library/postgres, and expect to see the same output with both.