incorrect URI in example when hive is used

[pandabrowski]

there is a problem, when the hive metastore is used, the network name is used to create a host name.
Because network name includes '_', generated URI is incorrect.
to solve it you can change a name of network in dockerfile:
networks: iceberg_net: name: "icebergnet"

[ismailsimsek]

Thank you @pandabrowski, do you like to send PR for fix?

[pandabrowski]

sorry, i'm short on time.