added host env

main.py

@@ -13,6 +13,7 @@ PERSON_B = os.environ.get("SPLITBUDDY_ROOMIE", "Idan")  # roommate
 DEFAULT_ACTOR = os.environ.get("SPLITBUDDY_ACTOR", "anon")  # who is using this device (optional)
 DEFAULT_A_SHARE_PCT = os.environ.get("SPLITBUDDY_DEFAULT_A_SHARE_PCT", 66.6667)  # <-- you pay 2/3 by default
 WEBAPP_PORT = os.environ.get("SPLITBUDDY_WEBAPP_PORT", 5050)
+WEBAPP_HOST = os.environ.get("SPLITBUDDY_WEBAPP_HOST", "0.0.0.0")
 
 # ----- Template filters -----
 @app.template_filter('human_time')
@@ -418,4 +419,4 @@ if __name__ == "__main__":
     os.makedirs(os.path.dirname(DB_PATH) or ".", exist_ok=True)
     with app.app_context():
         init_db()
-    app.run(debug=True, port=WEBAPP_PORT)
+    app.run(debug=True, port=WEBAPP_PORT, host=WEBAPP_HOST)