If you need to install a different version or use a custom configuration, please see this script. This script supports MongoDB 3.0.0 and above.
For example if you want to install 4.0.6, set that version and port number as environment variables in your project or add this in the Setup Commands:
export MONGODB_VERSION=4.0.6 export MONGODB_PORT=27017
Next, add these commands to shutdown the default MongoDB instance and install the new version.
sudo mongod --dbpath /var/lib/mongodb --shutdown \curl -sSL https://raw.githubusercontent.com/codeship/scripts/master/packages/mongodb.sh | bash -s