stack/resilient: Run pbs-status-feed once from buildout

The resiliency pull-backup-server status feed file `pbs-status-rss`
is generated by a cron running every 5 minutes. But there is a promise
that requires it to check the notifier status, meaning instanciation
fails until this file is available.

To allow the promise to succeed immediately, we generate the
feed a first time directly from buildout.

stack/resilient/buildout.hash.cfg

@@ -26,7 +26,7 @@ md5sum = 2b0c71b085cfe8017f28098c160b1f49
 
 [template-pull-backup]
 filename = instance-pull-backup.cfg.in
-md5sum = e64e13854332bcc2595df187fcae1203
+md5sum = b240dc76a663190304d8bcb9cabcda8f
 
 [template-replicated]
 filename = template-replicated.cfg.in

stack/resilient/instance-pull-backup.cfg.in

@@ -137,12 +137,17 @@ command-line = ${buildout:bin-directory}/generatefeed --output $${:feed-path} --
 feed-path = $${directory:monitor-resilient}/pbs-status-rss
 wrapper-path = $${rootdirectory:bin}/resilient-genstatusrss.py
 
+[pbs-status-feed-first-run]
+recipe = plone.recipe.command
+command = $${pbs-resilient-status-feed:wrapper-path}
+stop-on-error = true
+
 [cron-pbs-status-feed]
 <= cron
 recipe = slapos.cookbook:cron.d
 name = resilient-pbs-status-feed
 frequency = */5 * * * *
-command = $${pbs-resilient-status-feed:wrapper-path}
+command = $${pbs-status-feed-first-run:command}
 
 [logrotate-entry-notifier]
 <= logrotate-entry-base