Create a tmpfs at /var/log/haproxy.

Fixes #6.

roles/haproxy/tasks/main.yml

@@ -23,6 +23,14 @@
   notify:
     - Restart HAProxy
 
+- name: Add /var/log/haproxy to fstab
+  mount:
+    path: /var/log/haproxy
+    src: tmpfs
+    fstype: tmpfs
+    opts: rw,size=128m,mode=750,uid=20000,gid=20000
+    state: mounted
+
 - name: Create HAProxy service directories
   file:
     path: '/etc/s6-rc/service/{{ item }}'