Use node:8-alpine for ci building.

1 job for express-logger in 15 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #44783
test

00:00:15

 
Name Stage Failure
failed
test Test
npm ERR! undefined
npm ERR! No git binary found in $PATH
npm ERR!
npm ERR! Failed using git.
npm ERR! Please check if you have git installed and in your PATH.

npm ERR! A complete log of this run can be found in:
npm ERR! /root/.npm/_logs/2019-02-26T09_51_10_818Z-debug.log
ERROR: Job failed: exit code 1