Fix Hetzner's issue with GitLab CI

Description

It seems GitLab banned certain IP addresses that Hetzner uses. We need a way to ensure that CI uses an IP that will work with GitLab, every time.

Example CI failure: https://gitlab.com/whitebox-aero/whitebox/-/jobs/13241180276

Scope

• Use a floating IP for these CI runs

MRs

• !223 (merged)