Please update the base image

[aetos382]

The current base image is ruby:3.1.1-alpine3.15. In alpine 3.15, apk add bash does not seem to generate /etc/bash/bashrc (it does in 3.16 and later). Therefore, the common-utils feature cannot be installed when using this image with VSCode DevContainer.

[JV-conseil]

Hi 👋

While waiting for @envygeeks to update this repo, I've pushed to Docker Hub an updated version for jekyll/builder image: https://hub.docker.com/r/jvconseil/jekyll-docker

See also PR https://github.com/envygeeks/jekyll-docker/pull/369

Best, @JV-conseil