Add util-linux to common-alpine.sh

[felipecrs]

This package comes preinstalled in Debian, and provides some very common commands on Linux. Namely, I miss the script command.

The list of commands can be seemed here:

https://www.mankier.com/package/util-linux

[ryboe]

I built this and the linux/amd64 image size goes from 110 MB to 117 MB. That 7 MB buys us a long list of useful commands. However, a lot of those commands, like fstab, mkfs, cfdisk, and eject, aren't relevant to codespaces 🤔 It's a tough call.

[bamurtaugh]

Thanks for opening!

As a heads up, our team has been actively focused on an updated plan for community contributions and this repo moving forward, which we've now outlined in this issue: #1589. This includes moving to a couple new repos for images (https://github.com/devcontainers/images) and Features (https://github.com/devcontainers/features).

We anticipate to have a similar repo and distribution process for templates/definitions. We'll keep everyone updated (likely via another issue in this repo or comment on #1589) when our new templates repo is available and the process is defined.

Please let me know if you have any questions, thank you!