edit .gitlabci file

1 job for gitlab in 1 minute and 33 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #2950817
jobs

00:01:33

 
Name Stage Failure
failed
jobs Test There is an unknown failure, please try again
2016-08-09 15:00:14 (22.9 MB/s) - ‘arduino-1.6.9-linux64.tar.xz’ saved [96075820/96075820]

$ tar xf arduino-1.6.9-linux64.tar.xz
tar (child): xz: Cannot exec: No such file or directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now

ERROR: Build failed: exit code 1