How to Dockerize a Sinatra application

Docker is difficultIn my experience, Dockerizing a Rails application for the first time is pretty hard. Actually, doing anything with Docker seems pretty hard. The documentation isn’t that good. Clear examples are hard to find.Dockerizing Rails is too ambitious as a first goalWhenever I do anything for the first time, I want to do the simplest, easiest possible version of that thing before I try anything more complicated. I also never want to try to learn more than one thing at once.If I try to Dockerize a Rails application without any prior Docker experience, then I’m trying to learn the particulars of Dockerizing a Rails application while also learning the general principles of Docker at the same time. This isn’t a great way to go.