Add labels to run container

[francoiscampbell]

Adds labels that can be useful for finding the containers spawned on a host by this plugin. This can also enable automated tools to associate these docker-compose containers with the agent that started them.

Tested on our infra:

Question for maintainers: should this be behind a plugin config? I don't think so since it doesn't affect the behaviour of the container itself, but I'm happy to make it conditional if needed.

[toote]

This is a great addition! 👏

I would indeed add it behind a configuration, but have it on by default... the reason is two-fold:
1- whoever doesn't want/need the behaviour will be able to turn it off
2- it will make it simpler to not have to change all 75 tests and only turn it on in the feature-specific tests 😉 😉

[francoiscampbell]

Thanks for the feedback @toote, made it conditional (default true), updated the existing tests to disable the option, and added a new test.

[toote]

👏 @francoiscampbell

Just a minor comment and a cosmetic suggestion.

If you feel like making the changes, I would also suggest updating the plugin's versions in the readme with the next one (v4.11.0) to avoid having to create another PR in the future. But there is no hurry or need and we might merge and release this plugin without that change

[pzeballos]

Nice!