fix: [cron] force restart when schedule command are changed

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

cron/hooks/pre_deploy

@@ -0,0 +1,20 @@
+#!/bin/bash
+## Should be executable N time in a row with same result.
+
+set -e
+
+cron_config_hash() {
+    debug "Adding config hash to enable recreating upon config change."
+    config_hash=$({
+                     find "$SERVICE_CONFIGSTORE/etc/cron"{,.hourly,.weekly,.daily,.monthly} \
+                          -type f -exec md5sum {} \;
+                  } | md5_compat) || exit 1
+    init-config-add "
+$MASTER_BASE_SERVICE_NAME:
+  labels:
+    - compose.config_hash=$config_hash
+"
+}
+
+
+cron_config_hash || exit 1