add cron service

bubble-server/src/main/resources/docker/run_cron.sh

@@ -0,0 +1,2 @@
+#!/bin/bash
+cron -f

bubble-server/src/main/resources/packer/roles/common/tasks/docker.yml

@@ -11,7 +11,7 @@
     group: root
     mode: 0755
     state: directory
-  with_items: [ 'redis', 'postgresql', 'supervisor' ]
+  with_items: [ 'redis', 'postgresql', 'supervisor', 'cron' ]
 
 - name: Create /service/redis/run
   copy:
@@ -42,3 +42,11 @@
     owner: root
     group: root
     mode: 0755
+
+- name: Create /service/cron/run
+  copy:
+    src: run_cron.sh
+    dest: /service/cron/run
+    owner: root
+    group: root
+    mode: 0755