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 2 seconds)
latest
Status Job ID Name Coverage
  Test Pre Build
passed #7370
test_build_script

00:01:21

 
  Build
passed #7371
build_nginx_buster

00:04:40

passed #7373
build_nginx_jessie

00:05:36

passed #7372
build_nginx_stretch

00:05:45