add .gitlab-ci.yml

1 job for master in 27 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Deploy
failed #4589
pages

00:00:27

 
Name Stage Failure
failed
pages Deploy

Skipping Git submodules setup
$ bundle install
You have one or more invalid gemspecs that need to be fixed.
The gemspec at /builds/carlschwan/kde-jekyll-theme/kde-jekyll-theme.gemspec is
not valid. Please fix this gemspec.
The validation error was '"TODO: Put your gem's website or public repo URL
here." is not a valid HTTP URI'
ERROR: Job failed: exit code 1