[ship] feat(open-api): fix schema generation

[ejanusevicius]

Affected Components

• Content & Marketing
• Pricing
• Test
• Docs
• Learn
• Other

Notes for the Reviewer

Fixes the CI failure for mintlify sync.

https://github.com/checkly/docs/actions/runs/22860549544/job/66312977468

  shell: /usr/bin/bash -e {0}
📥 Fetching live API specification from https://api.checklyhq.com/openapi.json...
🔧 Cleaning up HTML in descriptions...
✅ Validating OpenAPI specification...
erro Access denied: path: /tmp/checkly_openapi.json is outside the current
    directory
Error: Process completed with exit code 1.