[BUG] `docker compose images --format json` is now a map and no longer a list

[felixfontein]

Description

Until recently, docker compose images --format json resulted in a list of JSON objects, with one image per JSON object. Now docker compose images --format json results in a map that maps image names to the image JSON object.

I think this got introduced in 2.37.0, since this wasn't the case in 2.36.2.

Since this isn't mentioned in the changelog (neither as a breaking change or as anything else), I guess this is a bug.

Steps To Reproduce

Run docker compose images --format json.

Compose Version

2.37.0

Docker Environment

doesn't matter

Anything else?

No response

[felixfontein]

This breaking change was introduced in eb3074b / #12856.

[felixfontein]

The new JSON output no longer contains the ContainerName field. The restored output from #12917 contains it.

[felixfontein]

Hmm, apparently I mislooked, the ContainerName field isn't there. I created a new issue for this: #12940.