fix ansible-lint warning by using a handler for invocation of systemd-tmpfiles

Author: tknerr

roles/cache/handlers/main.yml

@@ -0,0 +1,5 @@
+---
+
+- name: create-systemd-tmpfiles
+  command:
+    cmd: systemd-tmpfiles --create

roles/cache/tasks/main.yml

@@ -9,10 +9,5 @@
       d /var/cache/downloads 1777 root root -
     dest: /etc/tmpfiles.d/downloads.conf
     mode: 0644
-  register: download_cache
-
-- name: Trigger systemd to create /var/cache/downloads
-  command:
-    cmd: systemd-tmpfiles --create
-    creates: /var/cache/downloads
-  when: download_cache.changed
+  notify:
+    - create-systemd-tmpfiles