Make port more flexible when launching app

Author: jacquesbach

app.py

@@ -1563,5 +1563,6 @@ def shap_summary():
     # force_rebuild_daily_stats()
 
     self_heal_daily_stats()
-
-    app.run(host='0.0.0.0', port=5000, use_reloader=False)
+    
+    port = int(os.environ.get("PORT", 5000))
+    app.run(host='0.0.0.0', port=port, use_reloader=False)