Slow test execution on docker-for-mac

[raytung]

On docker:

$ time ./go test
# ...
$ ./go test  0.02s user 0.02s system 0% cpu 52.833 total

Without docker:

$ time npm test
# ...
$ npm test  5.89s user 0.56s system 93% cpu 6.898 total

[raytung]

https://forums.docker.com/t/file-access-in-mounted-volumes-extremely-slow-cpu-bound/8076/158

[z0u]

Can you try the docker-sync branch? It attempts to deal with this according to the suggestions in this comment:

• A special container is set up to receive source files.
• A daemon on the host syncs files to that container.
• The sync container's volume is mounted into the app container.

See README-docker.md for more details.

[raytung]

We just tried it out and it's still taking ~55secs