Update mitgliedschaft.md

1 job for master in 0 seconds (queued for 6 seconds)
Name Stage Failure
default Test
Running with gitlab-runner 14.2.0 (58ba2b95)
on website-neu EYpC1XQo

Resolving secrets
Preparing the "ssh" executor
Using SSH executor...
Preparing environment
Running on website-neu via website-neu...
ERROR: Job failed: prepare environment: Process exited with status 1. Check https://docs.gitlab.com/runner/shells/index.html#shell-profile-loading for more information