Use googledomains and only notify when the IP changes

mounts/ddclient/data/postscript_gotify.sh

@@ -1,7 +1,12 @@
 #!/bin/bash
-curl -s "$GOTIFY_ADDRESS/message" \
-    -X POST \
-    -H "X-Gotify-Key: $GOTIFY_TOKEN" \
-    -F "title=IP Address updated" \
-    -F "message=IP address detected as $1" \
-    -F "priority=5"
+
+if [ "$(cat /data/gotify_previous_ip || true)" != "$1" ]; then
+    echo -n "$1" > /data/gotify_previous_ip
+
+    curl -s "$GOTIFY_ADDRESS/message" \
+        -X POST \
+        -H "X-Gotify-Key: $GOTIFY_TOKEN" \
+        -F "title=IP Address updated" \
+        -F "message=IP address detected as $1" \
+        -F "priority=5"
+fi