Merge branch 'add/buster' into 'master'

Add buster build

See merge request !4
4 jobs for master in 7 minutes and 16 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Test Pre Build
passed #5288
test_build_script

00:01:23

 
  Build
passed #5289
build_nginx_buster

00:04:42

passed #5291
build_nginx_jessie

00:05:52

passed #5290
build_nginx_stretch

00:04:54