Use Nethermind as Optimism Sequencer

[emlautarom1]

Changes

• Support running Nethermind as a sequencer when no Optimism sequencer URL is provided

Types of changes

What types of changes does your code introduce?

• Bugfix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (a change that causes existing functionality not to work as expected)
• Optimization
• Refactoring
• Documentation update
• Build-related changes
• Other: Description

Testing

Requires testing

• Yes
• No

If yes, did you write tests?

• Yes
• No

Notes on testing

• Tested using https://github.com/ethpandaops/optimism-package using Nethermind as sequencer.
• Added unit test

Documentation

Requires documentation update

• Yes
• No

We don't have an Optimism section on the Nethermind docs yet.

Requires explanation in Release Notes

• Yes
• No

Remarks

Used the following args.yaml file for the ethpandas optimism kurtosis package:

optimism_package:
  participants:
    - el_type: op-nethermind
      el_image: emlautarom1/op-nethermind
    - el_type: op-nethermind
      cl_type: op-node

The emlautarom1/op-nethermind image was built locally from this PRs branch using

docker build -t emlautarom1/op-nethermind -f Dockerfile .

Note that the Dockerfile.chiseled version does not work in this scenario.

[emlautarom1]

This test is pretty much a copy/paste of:

nethermind/src/Nethermind/Nethermind.JsonRpc.Test/Modules/Eth/EthRpcModuleTests.cs

Line 1030 in 2d9dd7c

public async Task Send_transaction_with_signature_will_not_try_to_sign()