Merge branch 'add/buster' into 'master'

Add buster build

See merge request !4
4 jobs for master in 6 minutes and 35 seconds (queued for 4 seconds)
latest
Status Job ID Name Coverage
  Test Pre Build
passed #5043
test_build_script

00:01:23

 
  Build
passed #5044
build_nginx_buster

00:04:45

passed #5046
build_nginx_jessie

00:05:11

passed #5045
build_nginx_stretch

00:05:06