> You don't need a full prod db, you need a facsimile mirroring the real thing but 1/50th the size.

My experience has been that the problems in CI systems come from exactly these differences “works on my machine” followed by “oops, I guess the build machine doesn’t have access to that random DB”, or “docker push fails in our CI environment because credentials/permissions, but it works when I run it just on my machine”