ddns-scripts: add gandi.net provider

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/ddns-scripts/files/usr/lib/ddns/update_gandi_net.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+# Thanks goes to Alex Griffin who provided this script.
+
+local __TTL=600
+local __RRTYPE
+local __ENDPOINT="https://dns.api.gandi.net/api/v5"
+
+[ -z "$username" ] && write_log 14 "Service section not configured correctly! Missing subdomain as 'username'"
+[ -z "$password" ] && write_log 14 "Service section not configured correctly! Missing API Key as 'password'"
+
+[ $use_ipv6 -ne 0 ] && __RRTYPE="AAAA" || __RRTYPE="A"
+
+curl -s -X PUT "$__ENDPOINT/domains/$domain/records/$username/$__RRTYPE" \
+	-H "X-Api-Key: $password" \
+	-H "Content-Type: application/json" \
+	-d "{\"rrset_ttl\": $__TTL, \"rrset_values\": [\"$__IP\"]}" >$DATFILE
+
+write_log 7 "gandi.net answered: $(cat $DATFILE)"
+
+return 0