Add role for deploying SSH authorized_keys and add it to maint. playb.

Having this role will enable us to easily manage SSH authorized_keys.

playbooks/roles/authorized_keys/files/cit_authorized_keys

@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPH2H5bko/cRy5MGaHaKxQ1KT/f4m3RMS5Cy+qqSFdqh

playbooks/roles/authorized_keys/tasks/main.yaml

@@ -0,0 +1,6 @@
+- name: Deploy authorized keys for cit user
+  ansible.posix.authorized_key:
+    state: present
+    user: cit
+    exclusive: true
+    key: "{{ lookup('file', 'cit_authorized_keys') }}"