As tweeted: Docker image of Pharo VM, 7.0.3-based app Pharo image, changes/sources files, Ubuntu 16.04, 484MB. With Pharo VM Alpine Docker image, 299MB. Build app Pharo image from minimal, run without changes/sources, Alpine Pharo VM, 83MB!

And here's the Docker container resident set size upon switching from the 484MB Docker image to the Alpine-based Docker image:

Norbert Hartl and I are collaborating on minimizing Dockerized Pharo. All are welcome to join.