Merge branch 'add/buster' into 'master'

Add buster build

See merge request !4
4 jobs for master in 7 minutes and 7 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Test Pre Build
passed #7474
test_build_script

00:01:24

 
  Build
passed #7475
build_nginx_buster

00:04:26

passed #7477
build_nginx_jessie

00:04:50

passed #7476
build_nginx_stretch

00:05:42