Add .gitlab-ci.yml

1 job for gh-pages in 16 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #14027
test

00:00:16

 
Name Stage Failure
failed
test Test
Checking out 0f24d6df as gh-pages...

Skipping Git submodules setup
Checking cache for default...
No URL provided, cache will not be downloaded from shared cache server. Instead a local version of cache will be extracted.
Successfully extracted cache
$ bundle install --path vendor
Could not locate Gemfile
ERROR: Job failed: exit code 1