Added cluster-installation on STACKIT

[rbo]

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[github-actions]

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✨ Success! Uploaded 162 files (336 already uploaded) (6.79 sec)

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✨ Deployment complete! Take a peek over at https://4d07a6c8.openshift-examples.pages.dev
✨ Deployment alias URL: https://pr-149.openshift-examples.pages.dev

[github-actions]

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✨ Success! Uploaded 2 files (496 already uploaded) (1.60 sec)

🌎 Deploying...
✨ Deployment complete! Take a peek over at https://6c5b47cf.openshift-examples.pages.dev
✨ Deployment alias URL: https://pr-149.openshift-examples.pages.dev