Move single ansible playbook to ansible directory

Make ansible playbook properly- use ansible-galaxy init commands.

ansible/arch_dnet_ca/tasks/main.yml

@@ -0,0 +1,11 @@
+---
+# Install DNET CA
+- name: Download DNET CA
+  get_url:
+    url: https://vault.ducoterra.net/v1/dnet/ca
+    dest: /etc/ca-certificates/trust-source/anchors/dnet_ca.crt
+    mode: '0660'
+  become: yes
+- name: Update trust store
+  command: trust extract-compat
+  become: yes