add: signal polling cron job

roles/signal/tasks/main.yaml

@@ -5,3 +5,11 @@
     minute: "*"
     name: Poll Notifications from Dispatch (signal)
     job: "/home/sheppy/signal-http-gateway/signal-query-dispatch.py --target {{ event_dispatcher_address }} --user {{ event_dispatcher_user }} --password {{ event_dispatcher_pass }} --signal-cli-bin /home/sheppy/signal-cli/bin/signal-cli"
+
+- name: poll signal to keep account active
+  cron:
+    user: sheppy
+    hour: "*"
+    minute: "25"
+    name: Poll from signal
+    job: "/home/sheppy/signal-cli/bin/signal-cli --output=json -u +HISTORY_PURGED_SECRET receive --send-read-receipt >> /home/sheppy/signal.log"