Add pruning for PR preview deployments

[Bhumikagarggg]

Notes for Reviewers

This PR fixes #399

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[gemini-code-assist]

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[github-actions]

🚀 Preview deployment: https://layer5io.github.io/exoscale-academy/pr-preview/pr-400/

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[Rajesh-Nagarajan-11]

Why did you create a new one , when we have https://github.com/layer5io/exoscale-academy/commits/master/.github/workflows/preview-deploy.yml ???? @Bhumikagarggg

[CodexRaunak]

@Bhumikagarggg there is already a preview workflow the step needs to be appended in that than creating a new workflow

[Bhumikagarggg]

@Rajesh-Nagarajan-11 @CodexRaunak I accidentally created a new workflow file.

[Bhumikagarggg]

I've corrected it now by appending the step to the existing preview workflow instead. I also tested it locally (including pruning), and it’s working as expected.