Add authentik, tidy up recipe-footer

Signed-off-by: David Young <davidy@funkypenguin.co.nz>

_includes/kubernetes-flux-dnsendpoint.md

@@ -0,0 +1,21 @@
+### {{ page.meta.slug }} DNSEndpoint
+
+If, like me, you prefer to create your DNS records the "GitOps way" using [ExternalDNS](/kubernetes/external-dns/), create something like the following example to create a DNS entry for your Authentik ingress:
+
+```yaml title="/{{ page.meta.helmrelease_namespace }}/dnsendpoint-{{ page.meta.helmrelease_name }}.example.com.yaml"
+apiVersion: externaldns.k8s.io/v1alpha1
+kind: DNSEndpoint
+metadata:
+  name: "{{ page.meta.helmrelease_name }}.example.com"
+  namespace: {{ page.meta.helmrelease_namespace }}
+spec:
+  endpoints:
+  - dnsName: "{{ page.meta.helmrelease_name }}.example.com"
+    recordTTL: 180
+    recordType: CNAME
+    targets:
+    - "traefik-ingress.example.com"  
+```
+
+!!! tip
+    Rather than creating individual A records for each host, I prefer to create one A record (*`nginx-ingress.example.com` in the example above*), and then create individual CNAME records pointing to that A record.