Add labels to Docker images

[SheevaPlug]

SUMMARY

Add metadata (labels) to Docker images like "docker build --label ".

ISSUE TYPE

• Feature Idea

COMPONENT NAME

docker.community.docker_image

ADDITIONAL INFORMATION

Docker images can have labels to provide additional information for an image, for example to include the exact software version / branch / ... used for that build. The Docker cli can set image labels with the "--label" argument to "docker build". It would not only be an enhancement for some use cases, but also be consistent if docker_image supported this, as other modules in this collection like docker_container, docker_network and docker_volume already do.

- name: Build and push new image
  community.docker.docker_image:
    build:
      path: .
      labels:
        one: 1
        two: 2
    name: "{{ image_name }}"
    tag: "{{ image_tag }}"
    push: true
    source: build

[felixfontein]

#727 implements this.