sg: fails with unclear errors when running sg on old (unsupported) docker-compose versions

Created by: jhchabran

Context: https://sourcegraph-community.slack.com/archives/C02BG0M0ZJ7/p1634296034018800

The person is running docker-compose from 2017 and was facing odd errors related to interpolation when trying to compile the code.

Should we check the docker-compose version in sg doctor or before running commands?