Implement cap_add and cap_drop handling for docker_swarm_service

[andrasmaroy]

SUMMARY

With the 5.0.3 release of Docker SDK for Python support was added for these parameters for swarm services. With that adding support in Ansible should be as simple as exposing these variables for the module. That's what's done in this change.

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

docker_swarm_service

[github-actions]

Docs Build 📝

Thank you for contribution!✨

This PR has been merged and your docs changes will be incorporated when they are next published.

[andrasmaroy]

I'm a bit confused about these CI failures, the errors seem unrelated to me, am I just not seeing the full picture?

[felixfontein]

The CI errors are caused by your changes, see my explanation here: #294 (comment) Capabilities for swarm services need both a new enough Docker SDK for Python version and a new enough API version. The former is available on the CI nodes which fail, the latter is not.

Edit: I didn't see you added new commits, but its caused by the same problem: you are checking for one specific error message, but another one shows up (because of the API version).

[felixfontein]

BTW, you also need to mention the two new return values in the swarm_service return value example.

[felixfontein]

Looks good to me. I would be glad if someone more familiar with this module could also take a look at this :)

If nobody does, I'll also merge this one in roughly a week (probably next Saturday).

[WojciechowskiPiotr]

lgtm

[felixfontein]

@andrasmaroy also thanks for this contribution!
@WojciechowskiPiotr thanks again for reviewing!