Handle RQLite idempotency.

ansible/roles/rqlite/tasks/main.yml

@@ -6,8 +6,14 @@
     name: make
     state: present
 
+- name: Check if RQLite is already installed.
+  stat:
+    path: /var/xppl/rqlite
+  register: rqlite_install_directory
+
 - name: Get RQLite installed into project directory.
   make:
     chdir: /var/xppl
     target: install-rqlite
     creates: /var/xppl/rqlite
+  when: not rqlite_install_directory.stat.exists