Draft: Add GNU build-ids to each gitaly go binary
To more reliably support observability tools like perf and uprobes, each generated binary needs to have its own unique gnu-build-id.
Here we implement the simplest strategy: a random value
This satisfies the uniqueness requirement but makes builds non-repeatable.
For more background on goals and trade-offs, see: gitlab-com/gl-infra/scalability#1464 (comment 769013218)