Update pihole with liveness check

dezendorf/homelab/k3s/pihole/pihole.yaml

@@ -43,6 +43,15 @@ spec:
               path: /admin/
               port: 80
             initialDelaySeconds: 20
+          livenessProbe:
+            exec:
+              command:
+              - dig
+              - +short
+              - @127.0.0.1
+              - radarr.dezendorf.net
+            initialDelaySeconds: 60
+            periodSeconds: 30
           ports:
             - name: dns-udp
               containerPort: 53