add barebones knot config

This configuration does not yet do much but it provisions a knot
server that runs.

roles/auth-dns/tasks/01-install.yaml

@@ -0,0 +1,11 @@
+---
+- name: Install knot
+  tags: [ auth-dns ]
+  become: true
+  ansible.builtin.package:
+    name:
+      - knot
+      - knot-exporter
+      - knot-dnssecutils
+      - knot-dnsutils
+      - knot-host