To quickstart with docker, the documentation suggest to use the MinimalCompact/thumbor image: https://github.com/thumbor/thumbor/blob/82309288806bfa63d7be446ccad1f028ff470b0f/docs/getting_started.rst?plain=1#L34:L39
But it seems that repo has stopped using docker.io, so just following the readme you are going to use a very old image.
I would suggest to highlight this in the documentation.
Another question: I also see this https://hub.docker.com/r/thumbororg/thumbor/tags which is unclear if is the new way to go, or a totally different image.