fix: after enabling "post_asset_folder: true", only one format of posts can be rendered

[simonkimi]

What does it do?

I added a configuration option post_extensions to address the issue where only posts with the same extension as new_post_name are rendered when post_asset_folder: true.

To resolve this, simply add the file extensions into this configuration to enable rendering, which is useful for handling posts in multiple different file formats.

When post_extensions is not filled in or is empty, the rendering method remains the same as before to ensure compatibility.

fix #5523

Pull request tasks

• Add test cases for the changes.
• Passed the CI test.

[github-actions]

How to test

git clone -b master https://github.com/simonkimi/hexo.git
cd hexo
npm install
npm test

[github-actions]

Flamegraph

https://0a33eaa03e636b7081233f058ecae290d1357c3c-14-hexo.surge.sh/flamegraph.html
https://0a33eaa03e636b7081233f058ecae290d1357c3c-16-hexo.surge.sh/flamegraph.html
https://0a33eaa03e636b7081233f058ecae290d1357c3c-18-hexo.surge.sh/flamegraph.html

[coveralls]

Pull Request Test Coverage Report for Build 10438819295

Details

• 7 of 7 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.48%

---

Totals
Change from base Build 9746148173:	0.0%
Covered Lines:	9373
Relevant Lines:	9422

---

💛 - Coveralls