Fix self-generated content action

[pipo02mix]

What this PR does / why we need it

Towards https://github.com/giantswarm/giantswarm/issues/30464

Things to check/remember before submitting

• If you made content changes

  • Run make dev to render and proofread content changes locally.
  • Bump last_review_date in the front matter header if you reviewed the entire page.

[pipo02mix]

It works like a charm! -> https://github.com/giantswarm/docs/actions/runs/8850138492/job/24303705812