sorted out the nethermind launcher

src/participant_network/el/nethermind/nethermind_launcher.star

+load("github.com/kurtosis-tech/eth2-module/src/shared_utils/shared_utils.star", "new_port_spec", "path_join")
+load("github.com/kurtosis-tech/eth2-module/src/module_io/parse_input.star", "get_client_log_level_or_default")
+load("github.com/kurtosis-tech/eth2-module/src/el/el_client_context.star", "new_el_client_context")
+
+module_io = import_types("github.com/kurtosis-tech/eth2-module/types.proto")
+
+# The dirpath of the execution data directory on the client container
+EXECUTION_DATA_DIRPATH_ON_CLIENT_CONTAINER = "/execution-data"
+
+GENESIS_DATA_MOUNT_DIRPATH = "/genesis"
+
+RPC_PORT_NUM = 8545
+WS_PORT_NUM = 8546
+DISCOVERY_PORT_NUM = 30303
+ENGINE_RPC_PORT_NUM = 8551
+
+# Port IDs
+RPC_PORT_ID = "rpc"
+WS_PORT_ID = "ws"
+TCP_DISCOVERY_PORT_ID = "tcp-discovery"
+UDP_DISCOVERY_PORT_ID = "udp-discovery"
+ENGINE_RPC_PORT_ID = "engine-rpc"
+
+# required for wait & fact maybe
+# TODO see if it is otherwise remove
+GET_NODE_INFO_MAX_RETRIES = 30
+GET_NODE_INFO_TIME_BETWEEN_RETRIES = 1 * time.second
+
+PRIVATE_IP_ADDRESS_PLACEHOLDER = "KURTOSIS_IP_ADDR_PLACEHOLDER"
+
+# TODO push this into shared_utils
+TCP_PROTOCOL = "TCP"
+UDP_PROTOCOL = "UDP"
+
+USED_PORTS = {
+	RPC_PORT_ID: new_port_spec(RPC_PORT_NUM, TCP_PROTOCOL),
+	WS_PORT_ID: new_port_spec(WS_PORT_NUM, TCP_PROTOCOL),
+	TCP_DISCOVERY_PORT_ID: new_port_spec(DISCOVERY_PORT_NUM, TCP_PROTOCOL),
+	UDP_DISCOVERY_PORT_ID: new_port_spec(DISCOVERY_PORT_NUM, UDP_PROTOCOL),
+	ENGINE_RPC_PORT_ID: new_port_spec(ENGINE_RPC_PORT_NUM, TCP_PROTOCOL)
+}
+
+NETHERMIND_LOG_LEVELS = {
+	module_io.GlobalClientLogLevel.error: "ERROR",
+	module_io.GlobalClientLogLeve.warn:  "WARN",
+	module_io.GlobalClientLogLeve.info:  "INFO",
+	module_io.GlobalClientLogLevel.debug: "DEBUG",
+	module_io.GlobalClientLogLevel.trace: "TRACE",
+}
+
+
+
+def launch(
+	launcher,
+	service_id,
+	image,
+	participant_log_level,
+	global_log_level,
+	existing_el_clients,
+	extra_params):
+
+	log_level = get_client_log_level_or_default(participant_log_level, global_log_level, NETHERMIND_LOG_LEVELS)
+
+	service_config = get_service_config(launcher.el_genesis_data, image, existing_el_clients, log_level, extra_params)
+
+	service = add_service(service_id, service_config)
+
+	# TODO add facts & waits
+
+	return new_el_client_context(
+		"nethermind",
+		"", # nethermind has no ENR in the eth2-merge-kurtosis-module either
+		# Nethermind node info endpoint doesn't return ENR field https://docs.nethermind.io/nethermind/ethereum-client/json-rpc/admin
+		"", # TODO add Enode from wait & fact,
+		service.ip_address,
+		RPC_PORT_NUM,
+		WS_PORT_NUM,
+		ENGINE_RPC_PORT_NUM,
+	)
+
+
+def get_service_config(genesis_data, image, existing_el_clients, log_level, extra_params):
+	if len(existing_el_clients) < 2:
+		fail("Nethermind node cannot be boot nodes, and due to a bug it requires two nodes to exist beforehand")
+
+	bootnode_1 = existing_el_clients[0]
+	bootnode_2 = existing_el_clients[1]
+
+	genesis_json_filepath_on_client = path_join(GENESIS_DATA_MOUNT_DIRPATH, genesis_data.nethermind_genesis_json_relative_filepath)
+	jwt_secret_json_filepath_on_client = path_join(GENESIS_DATA_MOUNT_DIRPATH, genesis_data.jwt_secret_relative_filepath)
+
+	command_args = [
+		"--config=kiln",
+		"--log=" + log_level,
+		"--datadir=" + EXECUTION_DATA_DIRPATH_ON_CLIENT_CONTAINER,
+		"--Init.ChainSpecPath=" + genesis_json_filepath_on_client,
+		"--Init.WebSocketsEnabled=true",
+		"--Init.DiagnosticMode=None",
+		"--JsonRpc.Enabled=true",
+		"--JsonRpc.EnabledModules=net,eth,consensus,subscribe,web3,admin",
+		"--JsonRpc.Host=0.0.0.0",
+		# TODO Set Eth isMining?
+		"--JsonRpc.Port={0}".format(RPC_PORT_NUM),
+		"--JsonRpc.WebSocketsPort={0}".format(WS_PORT_NUM),
+		"--Network.ExternalIp={0}".format(PRIVATE_IP_ADDRESS_PLACEHOLDER),
+		"--Network.LocalIp={0}".format(PRIVATE_IP_ADDRESS_PLACEHOLDER),
+		"--Network.DiscoveryPort={0}".format(DISCOVERY_PORT_NUM),
+		"--Network.P2PPort={0}".format(DISCOVERY_PORT_NUM),
+		"--Merge.Enabled=true",
+		"--Merge.TerminalTotalDifficulty=0", # merge has happened already
+		"--Merge.TerminalBlockNumber=null",
+		"--JsonRpc.JwtSecretFile=%v".format(jwt_secret_json_filepath_on_client),
+		"--JsonRpc.AdditionalRpcUrls=[\"http://0.0.0.0:{0}|http;ws|net;eth;subscribe;engine;web3;client\"]".format(ENGINE_RPC_PORT_NUM),
+		"--Network.OnlyStaticPeers=true",
+		"--Network.StaticPeers={0},{1}".format(
+			bootnode_1.enode,
+			bootnode_2.enode,
+		),
+	]
+
+	if len(extra_params) > 0:
+		command_args.extend(extra_params)
+
+	return struct(
+		container_image_name = image,
+		used_ports = USED_PORTS,
+		cmd_args = command_args,
+		files_artifact_mount_dirpaths = {
+			genesis_data.files_artifact_uuid: GENESIS_DATA_MOUNT_DIRPATH
+		},
+		# TODO add private IP address place holder when add servicde supports it
+		# for now this will work as we use the service config default above
+		# https://github.com/kurtosis-tech/kurtosis/pull/290
+	)
+
+
+def new_nethermind_launcher(network_id):
+	return struct(
+		el_genesis_data = el_genesis_data
+	)