Replace time.now() with run_sh or run_python

[mieubrisse]

There is a time.now() call here:

eth-network-package/src/participant_network.star

Line 67 in 30d2ccf

final_genesis_timestamp = (time.now() + CL_GENESIS_DATA_GENERATION_TIME + num_participants*CL_NODE_STARTUP_TIME).unix

This is problematic, because it blocks the entire package from being used with idempotent runs.

What we need to do: replace the in-Starlark time.now() generation (which is an interpretation-time value) with a runtime value by generating the current time via run_sh or run_python. Hopefully, this should be the only change needed.

[leeederek]

+1 lets prioritize this. we have a user who is doing rapid dev loops with eth2-package and the lack of idempotent runs is causing friction.