Create sub domain if it does not exist

dyndns.sh

@@ -46,12 +46,20 @@ while ( true ); do
             # re-enable glob expansion
             set +f
             
-            test -z $record_id && echo "No record found with '$sub' domain name!" && continue
-
-            if [[ "$ip" != "$record_data" ]]; then
             data="{\"type\": \"A\", \"name\": \"$sub\", \"data\": \"$ip\"}"
             url="$dns_list/$record_id"
 
+            if [[ -z $record_id ]]; then
+                echo "No record found with '$sub' domain name. Creating record, sending data=$data to url=$url"
+                new_record=$(curl -s -X POST \
+                    -H "Content-Type: application/json" \
+                    -H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
+                    -d "$data" \
+                    "$url")
+                record_data=$(echo $new_record| jq -r ".data")
+            fi
+
+            if [[ "$ip" != "$record_data" ]]; then
                 echo "existing DNS record address ($record_data) doesn't match current IP ($ip), sending data=$data to url=$url"
 
                 curl -s -X PUT \