[CI] Make sure the nobody user account isn't expired on Arch

Summary: This is currently causing the AUR deployment to fail.

Test Plan: I used the fix to deploy 0.30.7

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Subscribers: PiRK

Differential Revision: https://reviews.bitcoinabc.org/D17365