db user name and password are now configured by environment variables

app/scripts/connection.php

@@ -1,8 +1,8 @@
 <?php
 
 $dbhost = "mysql";
-$dbuser = "grisu";
-$dbpass = "secret";
+$dbuser = $_ENV['DB_USER_NAME'];
+$dbpass = $_ENV['DB_PASS'];
 $dbname = "ksp";
 
 try {

docker-compose.yml

@@ -16,6 +16,9 @@ services:
       dockerfile: PHP.Dockerfile
     volumes:
       - ./app:/app
+    environment:
+      DB_USER_NAME: 'grisu'
+      DB_PASS: 'secret'
   mysql:
     image: mariadb:latest
     environment: