gitlab-ci: Fix uninitialized variable on package deployment

Signed-off-by: Vasilis Tsiligiannis <[email protected]>
7 jobs for master in 27 minutes and 41 seconds (queued for 1 second)
Status Job ID Name Coverage
  Style
passed #584304058
style

00:00:36

 
  Test
passed #584304059
test

00:12:01

 
  Build
passed #584304060
debian

00:10:22

 
  Deploy
passed #584337796
deploy

00:04:41

failed #584304061
deploy

00:01:13

failed #584316526
deploy

00:01:14

failed #584337009
deploy

00:01:07