Feature Request: Expose all upstream ExternalDNS providers in Operator API (CloudFlare, DigitalOcean, Linode, etc.)

Description

The ExternalDNS Operator currently only exposes a limited subset of DNS providers in its CRD API, despite the underlying ExternalDNS binary (v0.19.0) supporting 30+ providers. This limitation prevents users from leveraging the full capabilities of upstream ExternalDNS.

Current State

Operator Version: v1.3.1
Underlying ExternalDNS Version: ~v0.19.0 (binary dated 2024-09-08)
API Version: externaldns.olm.openshift.io/v1beta1

Currently Exposed Providers (in Operator API)

The ExternalDNS CRD currently only supports configuration for:

• AWS (Route53)
• Azure DNS
• BlueCat
• Google Cloud DNS
• Infoblox

Reference: spec.provider field in the CRD

Upstream Supported Providers (in binary)

The ExternalDNS binary included in the operator supports 30+ providers, including:

Missing Popular Providers:

• CloudFlare
• DigitalOcean
• Linode
• OVH
• Akamai
• DNSimple
• Vultr
• Scaleway
• TransIP
• GoDaddy
• Gandi
• NS1
• PowerDNS
• Pi-hole
• RFC2136 (generic DNS UPDATE)
• Webhook (custom providers)
• And many more...

Start by inspecting the ExternalDNS CRD's spec.provider field and comparing its exposed configuration with the providers supported by the bundled ExternalDNS v0.19.0 binary. The change is done when the Operator API can configure the requested upstream providers, with appropriate validation and behavior confirmed against the supported provider list.