Add expire_in for artifacts.

name: Merge Request

Description of merge request Old artifacts take up an increasing amount of space. Expire artifacts after one week by default.

Interfaces Will this merge request result in a backwards-incompatible interface change: No.

Expected semantic version number increment category (Please indicate x.y.z): z.

Issues this merge request solves N/A

New tag of master Yes.

New deployment When convenient.

Keep branch after merging No.

Notes N/A