Summary:
I had trouble building the Docker image on a mac because `stack build` was trying to use all the cores and subsequently running out of memory. It took me a while to find the right flag, so I added a note to the dockerfile.
Closes https://github.com/facebook/duckling/pull/135
Differential Revision: D6655605
Pulled By: patapizza
fbshipit-source-id: 559c9fde175ad89f64b5c487afb77e3b7d5b982f
Summary:
With the current Dockerfile, I get errors when trying to build:
```
Downloading lts-8.8 build plan ...
Downloaded lts-8.8 build plan.
Updating package index Hackage (mirrored at https://s3.amazonaws.com/hackage.fpcomplete.com/) ...
Selected mirror https://s3.amazonaws.com/hackage.fpcomplete.com/
Downloading root
Selected mirror https://s3.amazonaws.com/hackage.fpcomplete.com/
Downloading timestamp
Downloading snapshot
Downloading mirrors
Cannot update index (no local copy)
Downloading index
Updated package list downloaded
Populating index cache ...
Populated index cache.
Compiler version mismatched, found ghc-8.2.1 (x86_64), but expected minor version match with ghc-8.0.2 (x86_64) (based on resolver setting in /duckling/stack.yaml).
To install the correct GHC into /root/.stack/programs/x86_64-linux/, try running "stack setup" or use the "--install-ghc" flag.
The command '/bin/sh -c stack build' returned a non-zero code: 1
```
With these fixes, I run `stack setup` inside the docker image in case it was not setup previously on the host machine.
Closes https://github.com/facebookincubator/duckling/pull/98
Differential Revision: D6174261
Pulled By: patapizza
fbshipit-source-id: 4719d94
