External Link checker in scheduled build -> whitelist some pages

Can (and should) we whitelist some external pages where the link checker throws errors although not necessary?

Might be due to some misconfiguration of that external page ...

E.g.

• https://www.openstoragenetwork.org/
• in this log: https://gitlab.hzdr.de/hifis/hifis.net/-/jobs/196940

mentioned in merge request !131 (merged)

closed with merge request !131 (merged)

mentioned in commit 6e763b5f