Add web3 signer role

[barnabasbusa]

Should need something like this:

docker run -d -it --name web3signer \
-v /data/ethereum-network-config:/network-config:ro \
-v /data/teku-validator:/validator-data:rw \
consensys/web3signer:develop \
--http-listen-host "0.0.0.0" \
--http-listen-port 9000 \
--http-host-allowlist "*" \
--metrics-enabled=true \
--metrics-host "0.0.0.0" \
--metrics-port 9001 \
--metrics-host-allowlist "*" \
eth2 \
--network /network-config/config.yaml \
--Xtrusted-setup /network-config/trusted_setup.txt \
--keystores-path /validator-data/keys \
--keystores-passwords-path /validator-data/secrets \
--slashing-protection-enabled=false