Update Dockerfile

6 jobs for ci-test in 2 minutes and 44 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #973
apt

00:00:29

passed #974
cloudlab

00:00:58

passed #975
emulab

00:00:29

passed #976
phantomnet

00:00:29

 
  Deploy
passed #977
pages

00:00:17

passed pages:deploy

00:00:01