Merge branch 'add/buster' into 'master'

Add buster build

See merge request !4
5 jobs for master in 8 minutes and 15 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test Pre Build
passed #3694
test_build_script

00:02:26

canceled #3690
test_build_script

00:07:14

 
  Build
passed #3691
build_nginx_buster

00:03:34

passed #3693
build_nginx_jessie

00:05:43

passed #3692
build_nginx_stretch

00:05:48