Add artifacts class

[dvonessen]

gcip version you are using?

pip freeze | grep gcip

What should gcip do differently? Which functionality do you think we should add?

Right now, the gcip uses a static way to add GitLab artifacts. GCIP only provides a way to specify a path to which gets uploaded to the Artifactsstore.
I want to have a dynamic way to build a Artifact, so that I can either Upload just a file to Gitlab or to do more specific things like uploading codecoverage reports or anything else.

The implementation should be like the Cache class implementation.
For reference purposes see Job Artifacts, Artifacts reference

What are you trying to do? What problem would this solve?

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