Build file for DGraph Docker

Users
3

I tried this:

-FROM golang:1.6.2
+FROM golang:1.6.2-alpine

But, of course, that doesn’t work. Because we need apt-get packages to install RocksDB. If you want to send a pull request to do what you’re proposing and with RocksDB installed in the final Docker image, more than happy to accept it.

Thanks @compton!