fixturenet-plugeth Deneb/Cancun upgrade (#789)

Updates fixturenet-plugeth stack for the Deneb fork based on Geth v1.13.x:

- updates genesis generator tool, and simplifies the config: the default from `ethereum-genesis-generator` can be used for a from-genesis Merged chain.

Reviewed-on: #789
Reviewed-by: jonathanface <jonathanface@noreply.git.vdb.to>
Reviewed-by: Thomas E Lackey <telackey@noreply.git.vdb.to>

stack_orchestrator/data/compose/docker-compose-fixturenet-plugeth.yml

@@ -6,6 +6,7 @@ services:
       - ../config/fixturenet-eth/fixturenet-eth.env
     environment:
       RUN_BOOTNODE: "true"
+      CERC_SCRIPT_DEBUG: ${CERC_SCRIPT_DEBUG}
     image: cerc/fixturenet-plugeth-plugeth:local
     volumes:
       - fixturenet_plugeth_bootnode_geth_data:/root/ethdata