Added external dns for testing

apps/external-dns/deployment.yaml

@@ -0,0 +1,36 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: external-dns
+spec:
+  strategy:
+    type: Recreate
+  selector:
+    matchLabels:
+      app: external-dns
+  template:
+    metadata:
+      labels:
+        app: external-dns
+    spec:
+      serviceAccountName: external-dns
+      containers:
+        - name: external-dns
+          image: registry.k8s.io/external-dns/external-dns:v0.15.1
+          # If authentication is disabled and/or you didn't create
+          # a secret, you can remove this block.
+          args:
+            - --source=service
+            # Pihole only supports A/AAAA/CNAME records so there is no mechanism to track ownership.
+            # You don't need to set this flag, but if you leave it unset, you will receive warning
+            # logs when ExternalDNS attempts to create TXT records.
+            - --registry=noop
+            # IMPORTANT: If you have records that you manage manually in Pi-hole, set
+            # the policy to upsert-only so they do not get deleted.
+            - --policy=upsert-only
+            - --provider=pihole
+            # Change this to the actual address of your Pi-hole web server
+            - --pihole-server=http://10.0.0.2:8888
+            - --pihole-password=1234
+      securityContext:
+        fsGroup: 65534 # For ExternalDNS to be able to read Kubernetes token files