WebHost: automatically fill PATCH_TARGET -> HOST_ADDRESS and re-use it for rooms (#1518)

WebHost.py

@@ -33,6 +33,11 @@ def get_app():
         import yaml
         app.config.from_file(configpath, yaml.safe_load)
         logging.info(f"Updated config from {configpath}")
+    if not app.config["HOST_ADDRESS"]:
+        logging.info("Getting public IP, as HOST_ADDRESS is empty.")
+        app.config["HOST_ADDRESS"] = Utils.get_public_ipv4()
+        logging.info(f"HOST_ADDRESS was set to {app.config['HOST_ADDRESS']}")
+
     db.bind(**app.config["PONY"])
     db.generate_mapping(create_tables=True)
     return app