fix: generate '/f/devtools-releases.json' on the Windows platform

[AmosHuKe]

Description of what this PR is changing or adding, and why:

Running the dart run dash_site build --release command on the Windows platform results in an error:

[SERVER] [ERROR] Error while building Builder:
[SERVER] [ERROR] Bad state: No element
[SERVER] [ERROR] #0      List.first (dart:core-patch/growable_array.dart:352:5)
[SERVER] [ERROR] #1      _devtoolsReleasesIndex.<anonymous closure> (package:docs_flutter_dev_site/src/pages/custom_pages.dart:58:26)
...

Issues fixed by this PR (if any):

PRs or commits this PR depends on (if any):

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[gemini-code-assist]

Summary of Changes

Hello @AmosHuKe, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical build error encountered when generating the devtools-releases.json file on the Windows platform. The issue stemmed from hardcoded path separators in the releaseNotesPrefix variable, which caused startsWith checks to fail on Windows due to differing path conventions. By leveraging the package:path library to construct platform-agnostic paths, this change ensures that the build process completes successfully across all operating systems, improving the reliability of the site generation.

Highlights

• Windows Build Fix: Resolves a 'Bad state: No element' error that occurred when running the dart run dash_site build --release command on the Windows platform, specifically affecting the generation of devtools-releases.json.
• Platform-Agnostic Path Handling: Introduces the use of package:path to construct file paths in a platform-independent manner, replacing hardcoded forward slashes with dynamically joined path segments.
• Improved Reliability: Ensures that the site build process correctly identifies and processes DevTools release notes across different operating systems, enhancing the robustness of the build system.

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[gemini-code-assist]

Code Review

This pull request correctly addresses a build failure on the Windows platform. The root cause was a hardcoded path string using forward slashes, which is not platform-agnostic. The change to use path.joinAll from the path package ensures that the path prefix for DevTools release notes is constructed correctly on any operating system. The fix is accurate and well-targeted, and I have no further recommendations.

[parlough]

/gcbrun

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit c0e7ee5):

https://flutter-docs-prod--pr12716-patch-1-wyhe3yxe.web.app

[parlough]

Thanks for noticing and fixing this @AmosHuKe! Please do let me know if you hit any other issues on Windows. I appreciate it.

[parlough]

/gcbrun