Merge branch 'add/buster' into 'master'

Add buster build

See merge request !4
4 jobs for master in 6 minutes and 23 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test Pre Build
passed #5382
test_build_script

00:01:17

 
  Build
passed #5383
build_nginx_buster

00:03:39

passed #5385
build_nginx_jessie

00:05:05

passed #5384
build_nginx_stretch

00:05:00