[Docker] Add docker-cli-ompose to the base image of the container

[larsb24]

Proposal to add docker-cli-compose to the packages the backrest docker image ships by default.

I think it is useful to have access to the docker compose commands in hooks to stop and start whole stacks from backrest.

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[garethgeorge]

I'm a bit hesitant to merge this due to possibly increasing the image size, would you mind posting the size of the built image before and after including docker-compose ?

[xd003]

I'm a bit hesitant to merge this due to possibly increasing the image size, would you mind posting the size of the built image before and after including docker-compose ?

Is it possible to have an environment variable where users can define the specific packages they need, which would then be installed at runtime? This approach would allow users to install only the packages they require nothing more, nothing less resulting in a more streamlined and efficient setup.