To run the tunnelbroker in dev-mode we need to export `COMM_SERVICES_DEV_MODE` environment variable.
Following the current code approach, add the corresponding commands for the tunnelbroker to `package.json`.
Linear task: [[ https://linear.app/comm/issue/ENG-1101/read-env-variables-to-change-the-dynamodb-table-names-and-amqp-uri-in | ENG-1101 ]]