Provide an additional image for base-devel

The base image is getting used in various pipelines, sometimes to build Arch Linux packages. Quite often the base-devel package group is installed in those cases [1] [2] [3].

Therefore, I think it would be useful to provide an additional image which also includes the base-devel group. As the wiki states:

The most important package group is base-devel. [...]

Also, I think it would be quite useful to include the devtools package since I expect more CI builds with docker in the future. In that case, should the package be named base-devel? Or something else, like devel or build?

[1] https://gitlab.archlinux.org/archlinux/archiso/-/blob/master/.gitlab-ci.yml#L7 [2] https://gitlab.archlinux.org/ffy00/pacman/-/blob/master/.gitlab-ci.yml#L10 [3] https://git.hashworks.net/aur-packages/ci-cd/-/blob/master/github-packages.yml#L105