By default go binaries only include a Go build-id. Which is
deterministic and unique.

They don't include a Gnu build-id that should have the same
properties.

The Gnu build-id is used by several observably tools including
perf. Having a Gnu build-id allow these tools to uniquely identify a
binary and avoid conflicts when resolving debug symbols for those
binaries.

We're generating a Gnu build-id from the Go build-id, that way we're
sure to also have a deterministic and unique build-id. We do this by
compiling the binary once, getting the Go build-id from that, and then
re-building including a Gnu build-id.