Merge branch 'add/buster' into 'master'

Add buster build

See merge request !4
4 jobs for master in 7 minutes and 3 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test Pre Build
passed #7525
test_build_script

00:01:26

 
  Build
passed #7526
build_nginx_buster

00:04:16

passed #7528
build_nginx_jessie

00:05:36

passed #7527
build_nginx_stretch

00:05:19