Wait... this whole time reading this thread, I'm racking my brain for what bitnami provided (I used to use them before docker came around. I never would have got Redmine up and going without them -- the install seemed so foreign.) that building a docker image couldn't, because surely everyone knows how to build one from scratch, right?... right?

Is all the panic because everyone is trying to avoid learning how to actually install the pieces of software (once), and their magic (free) black boxes are going away?

I recommend VS Code remote connections and docker builds via the docker extension to do rapid build-run-redo. Remember to make sure it works from scratch each time. You can automate them with Jenkins... (which came first, the Jenkins or the Jenkins Docker image?) I also recommend Platform One. (you'll need a smart card) I also recommend reading the particular software's documentation ;)