fix governance validation workflow

[tenmoves]

Is your feature request related to a problem?

When receiving a code validation and it is validated by enough members of technical council it triggers CI worklflow and then CD workflow.

inside the CD workflow we trigger a validator container responsible for testing that everything works correctly in a testnet mode (multiple nodes connected), for this we need to for example measure benchmarks before and after applying the code proposal to make sure that there is no huge drop in metrics (for now the data is not used).

Describe the solution you'd like

we are doing a Process.sleep to make sure the container is still running between phase 1 and phase 2, but the duration of the sleep is arbitrary so for some slow machines it will not work also this not an elegant solution.

the best solution would be either to separate the validation workflow in 2 containers with a shared volume and only start validator_2 after we validated that validator_1 is done accordingly to the correct step in global cd workflow.

Another possible solution is to build validator_2 using validator_1 image (using docker commit) but I think first solution is more composable and extendable.

however we need to be sure that ip address given to the container is in the same subnet as the other container and that all nodes are still running in each validation step.

Additional context

Epic: #154