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 +1,6 @@
+- tags: [ auth-dns ]
+  name: Install knot
+  become: true
+  package:
+    name: [ knot, knot-exporter ]
+

roles/auth-dns/tasks/02-configure.yaml

@@ -0,0 +1,11 @@
+- tags: [ auth-dns ]
+  name: Deploy knot configuration file
+  become: true
+  notify: restart knot
+  template:
+    src: knot.conf.j2
+    dest: /etc/knot/knot.conf
+    owner: knot
+    group: knot
+    mode: u=rw,g=r,o=
+

roles/auth-dns/tasks/main.yaml

@@ -0,0 +1,2 @@
+- import_tasks: 01-install.yaml
+- import_tasks: 02-configure.yaml