fix: use all enrs for nimbus via bootstrap file (#450)

src/cl/nimbus/nimbus_launcher.star

@@ -385,10 +385,10 @@ def get_beacon_config(
                 cmd.append("--direct-peer=" + ctx.multiaddr)
     elif network not in constants.PUBLIC_NETWORKS:
         cmd.append(
-            "--bootstrap-node="
-            + shared_utils.get_devnet_enr(plan, el_cl_genesis_data.files_artifact_uuid)
+            "--bootstrap-file="
+            + constants.GENESIS_CONFIG_MOUNT_PATH_ON_CONTAINER
+            + "/bootstrap_nodes.txt"
         )
-
     if len(extra_params) > 0:
         cmd.extend([param for param in extra_params])