Add webhooks feature

[adamruzicka]

Why are you introducing these changes? (Problem description, related links)

It was supported by the old installer, but isn't supported by foremanctl yet.

What are the changes introduced in this pull request?

Add webhooks feature. So far it only deals with the foreman_webhooks plugin and it's hammer counterpart. Shellhooks is intentionally left out of scope of this PR.

How to test this pull request

Steps to reproduce:

At a bare minimum: ./foremanctl features | grep -i webhooks

To test fully:

1. ./foremanctl deploy --add-feature webhooks
2. Wait for it to deploy
3. Create a webhook that fires on domain creation
4. Create a domain
5. Observe the webhook being delivered

Checklist

• Tests added/updated (if applicable)
• Documentation updated (if applicable)

Requires

• Add foreman_webhooks plugin to foreman image foreman-oci-images#72

[adamruzicka]

• No package hammer-cli-plugin-foreman_webhooks available.

Huh, but the provide should be there https://github.com/theforeman/foreman-packaging/blob/rpm/develop/packages/plugins/rubygem-hammer_cli_foreman_webhooks/rubygem-hammer_cli_foreman_webhooks.spec#L22

Edit: Ohh, it's on EL10

[evgeni]

Yeah, it's using a copr of mine, as upstream Foreman doesn't have EL10 yet. I triggered a build of that hammer plugin and kicked off tests.

[evgeni]

@adamruzicka does anyone from your team wants to further review/test this, or shall we merge it?

[adamruzicka]

I'd vote for merging.

[evgeni]

this is what I call democracy ;)