bug: multiple op chains workflow is currently borken

[barnabasbusa]

ktc && kt run . --args-file .github/tests/multiple_l2s.yaml                   
INFO[2024-08-29T22:23:40+02:00] Cleaning old Kurtosis engine containers...   
INFO[2024-08-29T22:23:40+02:00] Successfully cleaned old Kurtosis engine containers 
INFO[2024-08-29T22:23:40+02:00] Cleaning enclaves...                         
INFO[2024-08-29T22:23:43+02:00] Successfully removed the following enclaves: 
8d4d8e769bc84deea07dc9c73889a0fa        cold-highland
INFO[2024-08-29T22:23:43+02:00] Successfully cleaned enclaves                
INFO[2024-08-29T22:23:43+02:00] Cleaning unused images...                    
INFO[2024-08-29T22:23:43+02:00] Successfully cleaned unused images           
INFO[2024-08-29T22:23:43+02:00] Creating a new enclave for Starlark to run inside... 
INFO[2024-08-29T22:23:46+02:00] Enclave 'sleeping-shore' created successfully 
INFO[2024-08-29T22:23:46+02:00] Executing Starlark package at '/Users/bbusa/Documents/Ethereum.nosync/optimism-package' as the passed argument '.' looks like a directory 
INFO[2024-08-29T22:23:46+02:00] Compressing package 'github.com/ethpandaops/optimism-package' at '.' for upload 
INFO[2024-08-29T22:23:46+02:00] Uploading and executing package 'github.com/ethpandaops/optimism-package' 
There was an error interpreting Starlark code 
Evaluation error: list index: got dict, want int
        at [github.com/ethpandaops/optimism-package/main.star:25:66]: run
        at [github.com/ethpandaops/optimism-package/src/package_io/input_parser.star:39:34]: input_parser
        at [github.com/ethpandaops/optimism-package/src/package_io/input_parser.star:75:27]: parse_network_params

Error encountered running Starlark code.

[barnabasbusa]

fixed: #74