Add README for setting up local docker cluster (#469)

* Add README for setting up local docker cluster

Co-authored-by: Yiming Zang <yzang@twitter.com>

Author: yzang2019

docker/README.md

@@ -0,0 +1,61 @@
+## Prerequisite
+
+### Install Docker and Docker Compose
+MacOS:
+```sh
+# The easiest and recommended way to get Docker and
+# Docker Compose is to install Docker Desktop here:
+https://docs.docker.com/desktop/install/mac-install/
+```
+
+Ubuntu:
+```sh
+# Follow the below link to install docker on ubuntu
+https://docs.docker.com/engine/install/ubuntu/#install-using-the-repository
+# Follow the below link to install standalone docker compose
+https://docs.docker.com/compose/install/other/
+```
+
+## Local Cluster
+
+Detailed instruction: see the `Makefile` in the root of [the repo](https://github.com/sei-protocol/sei-chain/blob/master/Makefile) 
+
+**To start a single local node**
+
+```sh
+make build-docker-node && make run-docker-node
+```
+
+**To start 4 node cluster**
+
+```sh
+# If this is the first time or you want to rebuild the binary:
+make docker-cluster-start
+
+# If you have run docker-cluster-start and build/seid exist, 
+# you can skip the build process to quick start by:
+make docker-cluster-start-skipbuild
+```
+All the logs and genesis files will be generated under the temporary build/generated folder. 
+
+```sh
+# To monitor logs after cluster is started
+tail -f build/generated/seid-0.log
+```
+
+**To ssh into a single node**
+```sh
+# List all containers
+docker ps -a
+# SSH into a running container
+docker exec -it [container_name] /bin/bash
+```
+
+****
+
+
+
+# Build with Us!
+If you are interested in building with Sei Network:
+Email us at team@seinetwork.io
+DM us on Twitter https://twitter.com/SeiNetwor

docker/localnode/scripts/step0_build.sh

@@ -3,8 +3,9 @@
 # Input parameters
 NODE_ID=${ID:-0}
 
-echo $"Build seid from local branch"
 # Build seid
+echo "Building seid from local branch"
+git config --global --add safe.directory /sei-protocol/sei-chain
 LEDGER_ENABLED=false
 make clean
 make build-linux

readme.md

@@ -121,6 +121,12 @@ WantedBy=multi-user.target
 * Create the symlinlk: `sudo systemctl enable seid.service` 
 * Start the node sudo: `systemctl start seid && journalctl -u seid -f`
 
+**Start a chain on 4 node docker cluster**
+
+* Start local 4 node cluster: `make docker-cluster-start`
+* SSH into a docker container: `docker exec -it [container_name] /bin/bash`
+* Stop local 4 node cluster: `make docker-cluster-stop`
+
 **Troubleshooting**
 
 * If you see any errors related to nitro, try: `make install-all`