Use lyda/golang:1.7 image for now.

Network is insanely slow tonight (hello snow). So building this to
cache the install of mysql-client and the install of golint.
The latter issue was noted and deliberately not fixed in
https://github.com/docker-library/golang/issues/102 .

Sigh.

.gitlab-ci.yml

-image: golang:1.7
+image: lyda/golang:1.7
 
 variables:
   MYSQL_ROOT_PASSWORD: "password"
   MYSQL_TEST: "true"
 
 before_script:
-  - go get -v github.com/golang/lint/golint
-  - apt-get update && apt-get install mysql-client
   - mysql -uroot -p$MYSQL_ROOT_PASSWORD -hmysql < db/seed.sql
 
 services: