get postgres connection params for tests from environment

Author: dantownsend

tests/postgres_conf.py

@@ -1,13 +1,16 @@
+import os
+
 from piccolo.engine.postgres import PostgresEngine
 from piccolo.conf.apps import AppRegistry
 
 
 DB = PostgresEngine(
-    {
-        "host": "localhost",
-        "database": "piccolo",
-        "user": "piccolo",
-        "password": "piccolo",
+    config={
+        "host": os.environ.get("PG_HOST", "localhost"),
+        "port": os.environ.get("PG_PORT", "5432"),
+        "user": os.environ.get("PG_USER", "postgres"),
+        "password": os.environ.get("PG_PASSWORD", ""),
+        "database": os.environ.get("PG_DATABASE", "piccolo"),
     }
 )