ansible-operator controller: Add an option to watch annotations

[gaelgatelement]

We'd want to watch annotations changes to trigger a reconciliation.

Notably fixes this closed issue, even if this is actually not our use-case. #4245

Description of the change:

This change adds an option watchAnnotationsChanges to ansible watches. When this option is used on a watch, any annotation change will trigger a reconciliation.

Motivation for the change:

In our case, we need this feature to be able to trigger the reconciliation of a resource when an external resource (a secret or a configmap for example) gets updated. We update the hash of the external resource in the annotation, which forces a reconciliation of the dependent resource.

Checklist

If the pull request includes user-facing changes, extra documentation is required:

• Add a new changelog fragment in changelog/fragments (see changelog/fragments/00-template.yaml)
• Add or update relevant sections of the docs website in website/content/en/docs

[gaelgatelement]

Hello, any news regarding this PR ? Do you expect something more ?

[asmacdo]

Sorry this one slipped through the cracks.

I've reopened the issue and marked it to be retriaged (by removing the milestone).

On Monday, this will be discussed in our community meeting, everyone is always welcome especially if you want to advocate for an issue.

This request seems reasonable to me, but I'd like some other eyes too. Once the issue is retriaged, I'll do a review here. @gaelgatelement Thanks for your patience-- double thanks for the PR!

[asmacdo]

Since we all get so many notifications, if something isn't getting attention, some light nagging is acceptable and encouraged. The community meeting is probably the most bang for the buck, but you can also ping us on slack.

https://kubernetes.slack.com/archives/C017UU45SHL

[gaelgatelement]

Hello ! I'm coming back to know if you had time to discuss about this PR ? Thanks !

[gaelgatelement]

Hello,

I rebased again. I'd love to be able to join you on slack if this is necessary to talk about this during the community meeting. But I'll need an invite, as my company does not have a slack account.

Can you send it to me at gaelg at element.io ?

Thanks.

[rashmigottipati]

@gaelgatelement if you're ever interested in joining the community meetings, you can find the links here: https://github.com/operator-framework/community

[asmacdo]

/lgtm