[feature/webpi] Hopefully finally fix this

build/webpi/install/mysql.sql

@@ -1 +1,15 @@
-USE PlaceHolderForDb$$
+USE PlaceHolderForDb$$
+
+DROP PROCEDURE IF EXISTS add_user $$
+
+CREATE PROCEDURE add_user()
+BEGIN
+DECLARE EXIT HANDLER FOR 1044 BEGIN END;
+GRANT ALL PRIVILEGES ON PlaceHolderForDb.* to 'PlaceHolderForUser'@'PlaceHolderForServer' IDENTIFIED BY 'PlaceHolderForPassword';
+FLUSH PRIVILEGES;
+END
+$$
+
+CALL add_user() $$
+
+DROP PROCEDURE IF EXISTS add_user $$