add cerberus docker

cerberus/README.md

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+## Introduction
+
+This docker stack allow you to run and manage https://github.com/Layr-Labs/cerberus remote signer. Please check the repo for motivation  behind the remote signer.
+
+## Setup
+
+1. Change your shell current working directory to this folder.
+
+2. Bring up docker compose
+
+```
+docker compose pull
+docker compose up -d
+```
+
+3. Connect cerberus into your operator network
+
+```
+# on mainnet
+docker network connect ava_ethereum cerberus
+
+# on testnet
+docker network connect ava cerberus
+```
+
+## Operator update
+
+Now you will have cerberus running and reachable from your operator. You can edit your operator.yaml config file and add this in
+
+
+```
+bls_remote_signer:
+  grpc_url: "cerberus:50051"
+  public_key: "<pub-key-from-cerberus>"
+  password: "<password-from-cerberus>"
+```
+
+You can delete the  bls_private_key_store_path in the config file and delete the bls password from your env.

cerberus/docker-compose.yaml

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+name: cerberus
+services:
+  cerberus:
+    container_name: cerberus
+    command:
+    - "--keystore-dir=/data/keystore"
+    ports:
+      - ${CERBERUS_GRPC_PORT:-9190}:
+    volumes:
+      - keystore:/data/keystore:rw
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "10m"
+        max-file: "10"
+    # Once EigenLayer release the official image, switch to it
+    image: ${CERBERUS_IMAGE:-avaprotocol/ceberus:latest}
+    restart: unless-stopped
+    networks:
+      - cerberus
+
+networks:
+  cerberus:
+    name: cerberus