ci: add 'go test -race' job
ci: add 'go test -race' job

Running every test with the race detector would add significant time to
CI. That additionaltime won't provide much value as many of the integration tests use
much of the same code.

For now we can run -race on some of the smaller packages. As we move
more code into smaller packages we should be able to add more packages
to the list that runs with '-race'.

For now this is running without parallelism, but we can enable that as
well when we need it.

boltdb fails the 'checkptr' check, which is automatically enabled by
'-race', so I've disabled checkptr as well.

hashicorp/consul,hashicorp/consul,hashicorp/consul,hashicorp/consul