libyaml-dev missing from ruby:3.3-slim

[seandilda]

I'm having problems rebuilding previously working containers due to libyaml-dev being removed from the ruby:3.3-slim image.

This may be related to #497

[yosifkit]

That is correct, they were still removed in the next 3.3.x release as discussed in that PR (#497 (comment)). So, 3.3.7-slim does not include the extra -dev packages (docker-library/official-images#18251), but 3.3.6-slim still does. In the *-slim (or *-alpine) images, you will need to install any dependencies that your Ruby gem installs require since they are designed to be as minimal as they can be and still run ruby.