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Document gradle-home-cache-cleanup

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@ -306,6 +306,21 @@ Each build is different, and some builds produce more Gradle User Home content t
[Cache debugging ](#cache-debugging-and-analysis) can provide insight into which cache entries are the largest,
and you can selectively [exclude content using `gradle-home-cache-exclude`](#gradle-user-home-cache-tuning).
#### Removing unused files from Gradle User Home before saving to cache
The Gradle User Home directory has a tendency to grow over time. When you switch to a new Gradle wrapper version or upgrade a dependency version
the old files are not automatically and immediately removed. While this can make sense in a local environment, in a GitHub Actions environment
it can lead to ever-larger Gradle User Home cache entries being saved and restored.
In order to avoid this situation, the `gradle-build-action` supports the `gradle-home-cache-cleanup` parameter.
When enabled, this feature will attempt to delete any files in the Gradle User Home that were not used by Gradle during the GitHub Actions workflow,
prior to saving the Gradle User Home to the GitHub Actions cache.
Gradle Home cache cleanup is disabled by default. You can enable this feature for the action as follows:
```yaml
gradle-home-cache-cleanup: true
```
## Saving build outputs
By default, a GitHub Actions workflow using `gradle-build-action` will record the log output and any Build Scan links for your build,