[NIT-2799] Add mock external signer #104
Merged
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Fixes: NIT-2799
Currently, there isn't a configuration on the nitro test node that uses the external signer feature. In this PR, we are adding an optional flag to test that enables an external signer. Instead of using the secure signer, which is non-trivial to set up, we are creating a new binary in the nitro repository that mocks the external signer interface. This binary receives the account private key as a command-line argument and start a RPC server.