Make https://hub.docker.com/r/docker/compose/ more usable

[tmaier]

https://hub.docker.com/r/docker/compose/
Common use case for this repo: Run docker-compose within a CI pipeline, which is based on docker-in-docker.

As MVP, please do the following:

• Add a reference to the Dockerfile which is being used here
• Add automated build from repo
• Add automated build when the dependent image alpine has been updated
• Add a latest tag

On top of this, please consider

• Add explanation how to use this together with docker:dind

[tmaier]

This might get obsolete if docker-library/docker#30 gets merged.

[mathroc]

I would also suggest to follow Dockerfile best practices about entrypoint

right now I can't use it in gitlab CI because it tries to run sh in the image but it results in trying to run docker-compose sh

the issue on gitlab for the gitlab ci use case

[tianon]

I'd be curious to know the opinion of Compose maintainers on docker-library/docker#30 -- should docker:compose be created? Should we instead continue to punt users asking for it to the officially-upstream-maintained docker/compose image? Should we look to create a new docker-compose official image?

(Happy to help with or implement any of these, but I'd rather not move forward on any of this without the support and/or blessing of the Compose maintainers. 😄)

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[yxliang01]

+1 for making docker-compose image as an official image @tianon

[tianon]

My comment at #4287 (comment) is still pretty much verbatim the same set of questions I'd have for maintainers here (although I'd probably be less keen on the docker:compose variant now).

I'm happy to do the legwork to make/maintain an image for this, but I don't want to step on any toes or go against maintainer's wishes.