Log only once

src/freedombone

 
 	add_ddns_domain $GIT_DOMAIN_NAME
 
-	echo "Gogs domain:$GIT_DOMAIN_NAME" >> $COMPLETION_FILE
+	if ! grep -q "Gogs domain:" $COMPLETION_FILE; then
+		echo "Gogs domain:$GIT_DOMAIN_NAME" >> $COMPLETION_FILE
+	fi
 	echo 'install_gogs' >> $COMPLETION_FILE
 }