Merge branch 'add/buster' into 'master'

Add buster build

See merge request !4
4 jobs for master in 6 minutes and 5 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Test Pre Build
passed #7837
test_build_script

00:01:11

 
  Build
passed #7838
build_nginx_buster

00:03:46

passed #7840
build_nginx_jessie

00:04:45

passed #7839
build_nginx_stretch

00:04:53