Surface gitaly compile error when running tests

Kamil Trzcińskirequested to merge
error-out-when-gitaly-fails into master

What does this MR do and why?

Gitaly might error out when trying to compile for tests which results in a cryptic could not connect to tmp/tests/gitaly/gitaly.socket.

This ensures that proper message is printed with the command execution output.

Related to: gitlab-compose-kit#59 (closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Kamil Trzciński

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