Add Webhook provider to External-DNS

[aclerici38]

Is your feature request related to a problem?

In v0.14.0 External-DNS released webhooks (see PR 3063). From the PR, it seems like most if not all new providers will be added this way, hindering the Truecharts chart since in the providers listed on the Truecharts chart there is no 'webhooks' option. See this adguard implementation and the others listed on their docs .

Describe the solution you'd like

Added functionality for Webhooks to be used. The documentation on it is nonexistent and I'm not smart enough to figure out exactly how it works, but it would be optimal if webhooks was selected for webhook container URI or something to show with options to add env, then added as a sidecar, but I have no idea what the level of complexity of this would be.

Describe alternatives you've considered

I think just selecting 'webhooks' and a field under it for WebhookProviderURL to be passed as an arg would be easy enough for the average user as well. Then I guess the user would run their webhook of choice in a custom-app.

Additional context

No response

I've read and agree with the following

• [X] I've checked all open and closed issues and my request is not there.
• [X] I've checked all open and closed pull requests and my request is not there.

[PrivatePuffin]

If you want to expedite this enhancement, please consider putting a bounty on it here:

https://opencollective.com/truecharts-bounties/contribute/place-bounty-72003