start: specify compose file path

Allows for renaming it.

Signed-off-by: Jakub Sokołowski <jakub@status.im>

tasks/start.yml

@@ -2,6 +2,7 @@
 - name: 'Create database container'
   docker_compose:
     project_src: '{{ postgres_ha_service_path }}'
+    files:       '{{ postgres_ha_compose_file }}'
     state:       '{{ compose_state }}'
     restarted:   '{{ compose_restart }}'
     recreate:    '{{ compose_recreate }}'