Generate a reverse dependency file for "gitlab-deps server"

The server needs the reverse dependency graph, make sure the
update-gitlab-deps script generates it as well.
3 jobs for master in 22 seconds
latest
Status Job ID Name Coverage
  Build Pkgsrc
passed #19386
build_pkgsrc:buster

00:00:04

 
  Build Pkg
passed #19387
amd64
build_pkg:buster:amd64

00:00:10

 
  Upload Pkg
passed #19388
upload_pkg

00:00:07