environment variables for db connection

server.py

@@ -1,11 +1,12 @@
 from flask import Flask, render_template, request
 import mariadb
+import os
 
 mydb = mariadb.connect(
-    host="",
-    user="",
-    password="",
-    database=""
+    host=os.environ.get("HOST"),
+    user=os.environ.get("USER"),
+    password=os.environ.get("PASSWORD"),
+    database="new_trello"
 )
 
 cursor = mydb.cursor()