I would like to suggest having an official Crystal Alpine docker image available on DockerHub, like Ruby does
I found this unofficial image, which seems to work, but it would be nice to have something more formal.
Also, as a side note - I am not sure what are the minimum requirements by DockerHub to become an official library repository, but it would be nice if Crystal is accepted as an official library repo, rather than a repo of the “crystallang” user. So we can
FROM crystal:alpine in our Dockerfiles.