Fix CloudFlare provider to return a single endpoint for each name/type.

Install ca-certificates

Related to #1037

Add --infoblox-max-results setting

Co-Authored-By: Raffaele Di Fazio <difazio.raffaele@gmail.com>

sanitize dockerfiles for external-dns

add empty source

Add Cloud Foundry routes as a source

distroless/static image

Cache the endpoints on the controller loop

The controller will retrieve all the endpoints at the beginning of its
loop. When changes need to be applied, the provider may need to query
the endpoints again. Allow the provider to skip the queries if its data was
cached.

add TransIP as a provider

Add --ns1-endpoint and --ns1-ignoressl flags

DNSimple: Support apex records

Update aws.md

Fixes `Failed to watch *v1.Node: unknown (get nodes)`

In DNSimple, apex records are represented with an empty name. Respect
this in the provider code.

Add docker image faq