* The newest stable version of docker for mac triggers an issue in test containers (see issue). The test containers maintainers have a fix but it is currently only in 1.15.0-rc2. This PR upgrades that for now. Without this fix, if you are on the newest version of docker for mac, you can't build our project. * Issue to upgrade to 1.15 when it becomes stable so we don't stay on the RC forever: https://github.com/airbytehq/airbyte/issues/493