Add role dd24-dyndns-cron

Setup cron job to call curl for DynDNS update

roles/dd24-dyndns-cron/defaults/main.yml

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+# DD24 Cron configuration
+---
+dyndns_domain: www.example.com
+dyndns_password: yourpassword
+dyndns_ip: auto

roles/dd24-dyndns-cron/handlers/main.yml

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+# handlers file for cron-dd24-dyndns
+---
+- name: reload cron
+  ansible.builtin.shell:
+    cmd: service cron reload
+    warn: no
+# Use the shell call because the task sometimes has problems finding the service state
+#  service:
+#    name: cron
+#    state: restarted

roles/dd24-dyndns-cron/tasks/main.yml

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+---
+- name: Make sure cron and curl are installed
+  apt:
+    name:
+      - cron
+      - curl
+    state: present
+
+- name: Setup cron file for DD24 updates
+  ansible.builtin.template:
+    src: "templates/dd24-dyndns.cron.j2"
+    dest: "/etc/cron.d/dd24-dyndns"
+    owner: root
+    group: root
+    mode: "0644"
+  notify: reload cron
+  # There is ansible.builtin.cron, but this makes configuration much
+  # more complicated, so we stick to the template.

roles/dd24-dyndns-cron/templates/dd24-dyndns.cron.j2

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+# /etc/cron.d/dd24-dyndns: Cron call to renew DynDNS entry
+
+SHELL=/bin/sh
+PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
+
+*/5 * * * * root curl "https://dynamicdns.key-systems.net/update.php?hostname={{dyndns_domain}}&password={{dyndns_password}}&ip={{dyndns_ip}}" > /dev/null