fix(ci): clean /homeless-shelter before Renovate's Nix commands

[jbw976]

Description of your changes

This PR ports crossplane/crossplane-runtime#1118 from crossplane-runtime to this crossplane/cli repo as well:

• fix(ci): clean /homeless-shelter before Renovate's Nix commands crossplane-runtime#1118

I have:

• Read and followed Crossplane's contribution process.
• Run ./nix.sh flake check to ensure this PR is ready for review.
• Added or updated unit tests.
• Linked a PR or a docs tracking issue to document this change.
• Added backport release-x.y labels to auto-backport this PR.

Need help with this checklist? See the cheat sheet.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: 09a76d48-18a3-4ab8-8083-3aa191ba7a01

📥 Commits

Reviewing files that changed from the base of the PR and between 3c8f298 and e994fac.

📒 Files selected for processing (1)

• .github/renovate-entrypoint.sh

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📝 Walkthrough

Walkthrough

The Renovate entrypoint documentation now distinguishes post-build cleanup from failure cleanup. The crossplane-nix launcher removes /homeless-shelter contents before starting Nix.

Changes

Renovate Nix cleanup

Layer / File(s)	Summary
Pre-launcher cleanup .github/renovate-entrypoint.sh	The crossplane-nix launcher cleans /homeless-shelter before forwarding arguments to Nix. Comments describe the separate cleanup points for successful and failed builds.

Estimated code review effort: 2 (Simple) | ~5 minutes

Merge Risk: ⚪ Minimal · up to e994f

This localized CI change is merge-ready after normal checks and review; no actionable merge-blocking risk remains.

Possibly related PRs

• crossplane/cli#257: Adds the related /homeless-shelter cleanup logic in the Renovate entrypoint.

Suggested reviewers: jcogilvie

🚥 Pre-merge checks | ✅ 6

✅ Passed checks (6 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is 63 characters and clearly describes cleaning /homeless-shelter before Renovate's Nix commands.
Description check	✅ Passed	The description explains that the change ports a related PR and updates CI cleanup behavior for Renovate's Nix commands.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Breaking Changes	✅ Passed	The pull-request diff changes only .github/renovate-entrypoint.sh; it does not modify files under apis/** or cmd/**, so the check's failure conditions do not apply.
Feature Gate Requirement	✅ Passed	The diff changes only .github/renovate-entrypoint.sh to clean /homeless-shelter before Nix commands; it adds no experimental API or product feature requiring a feature flag.

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