Allow user to specify root folder for artifacts

Release notes

{placeholder for release notes}

Problem

I have a build step

deploy:
  stage: deploy
  script: ...
  artifacts:
    paths:
    - ci/deploy/

In gitlab I can browse and download the artifacts. However all files are stored in a folder ci/deploy

Lets say my directory structure looks like this

ci/deploy/packages/package1.zip
ci/deploy/packages/package2.zip
ci/deploy/docs/toc.txt
ci/deploy/docs/file.txt

What I really want is an archive containing

packages/package1.zip
packages/package2.zip
docs/toc.txt
docs/file.txt

Proposal

Specify a root directory. Paths/excludes will then match relative to that root.

# File on disk is located in <build_dir>/root/dir/file.txt

artifacts:
  root: root
  paths: 
    - dir/file.txt

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