Add CRON schedule to route53-ddns service

Signed-off-by: Webster Mudge <wmudge@gmail.com>

docs/applications/route53_ddns.md

@@ -32,3 +32,9 @@ To set up Route53 to work with the service, please review the [Prerequisites](ht
 | route53_hosted_zone_id | Route53 hosted zone ID         | mandatory |
 | route53_ttl            | Time-to-live for the DNS entry |           |
 | route53_host           | Wildcard domain to update      |           |
+
+### Application
+
+| Parameter        | Description                                         | Status    |
+|------------------|-----------------------------------------------------|-----------|
+| route53_schedule | [CRON](https://pkg.go.dev/github.com/robfig/cron?utm_source=godoc#hdr-CRON_Expression_Format) schedule for checking and updating DNS entry |           |

roles/route53_ddns/defaults/main.yml

@@ -18,5 +18,8 @@ route53_host: "*.{{ ansible_nas_domain }}"
 # The Time-To-Live for the DNS entry
 route53_ttl: 600
 
+# The CRON string schedule for checking and updating
+route53_schedule: "*/30 * * * *"
+
 # Container
 route53_memory: 512MB

roles/route53_ddns/tasks/main.yml

@@ -16,6 +16,8 @@
     name: route53-ddns
     image: crazymax/ddns-route53:latest
     pull: true
+    env:
+      SCHEDULE: "{{ route53_schedule | string }}"
     volumes:
       - "{{ route53_data_directory }}/ddns-route53.yml:/etc/ddns-route53/ddns-route53.yml"
     restart_policy: unless-stopped