Update .gitlab-ci.yml

2 jobs for master in 30 seconds
Status Name Job ID Coverage
  Test
failed csv_check #6141

00:00:16

passed pdf_check #6140

00:00:14

 
Name Stage Failure
failed
csv_check Test
    current directory: /usr/lib/ruby/gems/2.5.0/gems/ffi-1.10.0/ext/ffi_c
/usr/bin/ruby -r ./siteconf20190402-16-cz51j6.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

extconf failed, exit code 1

Gem files will remain installed in /usr/lib/ruby/gems/2.5.0/gems/ffi-1.10.0 for inspection.
Results logged to /usr/lib/ruby/gems/2.5.0/extensions/x86_64-linux/2.5.0/ffi-1.10.0/gem_make.out
ERROR: Job failed: exit code 1