Fix Varnish systemd unit

We need to switch to copy module instead of ini_file since it doe not
support putting the same key multiple times in a section.

varnish/files/varnish.conf

@@ -0,0 +1,4 @@
+[Service]
+ExecStart=
+ExecStart=/usr/sbin/varnishd -a 0.0.0.0:80 -T localhost:6082 -f /etc/varnish/default.vcl -S /etc/varnish/secret -s malloc,2G -p thread_pools=2 -p thread_pool_add_delay=2 -p thread_pool_min=500 -p thread_pool_max=5000 
+ExecReload=/etc/varnish/reload-vcl.sh

varnish/tasks/main.yml

@@ -24,12 +24,7 @@
     state: directory
 
 - name: Modify Varnish configuration files
-  ini_file:
-    dest: /etc/systemd/system/varnish.service.d/varnish.conf
-    section: Service
-    option: "{{ item.option }}"
-    value: "{{ item.value }}"
+  copy:
+    src: varnish.conf
+    dest: /etc/systemd/system/varnish.service.d/
   notify: reload systemctl
-  with_items:
-    - { option: ExecStart, value: "/usr/sbin/varnishd -a 0.0.0.0:80 -T localhost:6082 -f /etc/varnish/default.vcl -S /etc/varnish/secret -s malloc,{{ malloc }} -p thread_pools={{ thread_pools }} -p thread_pool_add_delay=2 -p thread_pool_min=500 -p thread_pool_max=5000 "}
-    - { option: ExecReload, value: "/etc/varnish/reload-vcl.sh" }