Set a different GANACHE_NETWORK in env variables for each development machine to avoid overriding the network config in the build artifact (as it's committed to version control).
Run scripts/deploy_ganache.sh from root dir to start the Ganache instance and deploy contracts. It will also install Ganache, Truffle and any other dependencies specified in the contracts dir package.json.
It is advised to also specify a valid MNEMONIC in env vars to persist the accounts and deployments across runs.
Here are all the vars that can be explictly set:
GANACHE_PATH
GANACHE_PORT
GANACHE_NETWORK
CONTRACTS_PATH
You may also run the script with the -r (or --reset) flag to delete Ganache's persisted data in GANACHE_PATH and re-deploy all contracts.