[WIP] docker: add docker-compose for testing validators and nodes

[yutelin]

Cherry pick:

git cherry-pick -n 251c5a8016ddf9c336854831a6153ad3fa7e790e

Build 4-validator:

docker-compose --file docker-compose-v.yml build

Run 4-validator:

docker-compose --file docker-compose-v.yml up -d

Build 4-validator-3-node:

docker-compose --file docker-compose-v-n.yml build

Run 4-validator-3-node:

docker-compose --file docker-compose-v-n.yml up -d