Fix working dir issues in gitlab-ci.

3 jobs for master in 3 minutes and 54 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #2824
emulab-grub2-x86

00:03:38

 
  Deploy
manual #2826
allowed to fail manual
deploy_production
failed #2825
deploy_testing

00:00:16

 
Name Stage Failure
failed
deploy_testing Deploy
Missing username
usage: sftp [-1246aCfpqrv] [-B buffer_size] [-b batchfile] [-c cipher]
[-D sftp_server_path] [-F ssh_config] [-i identity_file] [-l limit]
[-o ssh_option] [-P port] [-R num_requests] [-S program]
[-s subsystem | sftp_server] host
sftp [user@]host[:file ...]
sftp [user@]host[:dir[/]]
sftp -b batchfile [user@]host
ERROR: Job failed: exit code 1