Test notebooks action does not trigger correctly!!

[jpfeuffer]

Describe the problem you encountered
The action should trigger on every (forced) push to master+ipynb but does not!
Probably due to Gihub's measures to prevent infinite triggers between actions.
This has to be fixed for actually being useful in catching errors!
@timosachsenberg @poshul

To Reproduce
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2. Click on '....'
3. Scroll down to '....'
4. See error

What should be happening

Screenshots

System information:

• OS:
• OS Version:
• Python version:
• pyopenms version:
• How did you install pyopenms? Please cross a box with an X.
  • conda::bioconda: Specify your conda/mamba command and/or your environment with conda list.
  • conda::openms: Specify your conda/mamba command and/or your environment with conda list.
  • pip
  • nightly wheel
  • built from source

Additional context