Github action example with actions/cache usage

[kravetsone]

continues of shikijs/shiki#840

We have .vitepress/cache directory which contains some files which vitepress uses as cache.

Does we should to include it in our workflow as step with actions/cache? For example:

- uses: actions/cache@v4
              with:
                  path: ./docs/.vitepress/cache
                  key: ${{ runner.os }}-vitepress-${{ hashFiles('**/bun.lockb') }}-${{ hashFiles('docs/**') }}
                  restore-keys: |
                      ${{ runner.os }}-vitepress

What are the best practices or pros and cons of using actions/cache on .vitepress/cache folder?

It would be great to include this in documentation

For now deploy#github-pages don't use it. Its just missed or it have some side-effects?

[brc-dd]

Should be fine I guess. We can add it.