Add docker container definition

Change-Id: If32020e6b8e8bb816eb54533554b18cc5302b5c9
diff --git a/ranking.php b/ranking.php
index c447b80..c682d64 100644
--- a/ranking.php
+++ b/ranking.php
@@ -12,8 +12,8 @@
 	require './php/utils.php';
 	
 	$credentials = new Credentials();
-	$usersdb = $credentials->usersdb;
-	$mortsdb = $credentials->mortsdb;
+	$usersdb = $credentials->usersdb();
+	$mortsdb = $credentials->mortsdb();
 	
 	// Mateix grau i curs => 100, Mateix grau diferent curs => 150, Diferent grau => 200
 	$getranking = "SELECT $mortsdb.assassi AS id, $usersdb.nom, $usersdb.grau, $usersdb.curs, count($mortsdb.assassi) AS kills,