Check to see if docker compose exists, else error out #1733
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One of our most common errors that we're seeing on self-hosted occurs when docker-compose doesn't exist. Our version check then throws an exception.
https://self-hosted.getsentry.net/organizations/self-hosted/issues/16/?query=is%3Aunresolved
This PR adds logic to ensure that we're able to find the version of docker compose and output an error msg to the user when docker compose does not exist.