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Add notes for cache #25

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Add notes for cache #25

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6 changes: 4 additions & 2 deletions README.md
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Expand Up @@ -113,14 +113,16 @@ Currently, the following distributions are supported:
**NOTE:** For Azul Zulu OpenJDK architectures x64 and arm64 are mapped to x86 / arm with proper hw_bitness.

### Caching packages dependencies
The action has a built-in functionality for caching and restoring dependencies. It uses [actions/cache](https://github.com/actions/cache) under hood for caching dependencies but requires less configuration settings. Supported package managers are gradle, maven and sbt. The format of the used cache key is `setup-java-${{ platform }}-${{ packageManager }}-${{ fileHash }}`, where the hash is based on the following files:
The action has a built-in functionality for caching and restoring dependencies. It uses [toolkit/cache](https://github.com/actions/toolkit/tree/main/packages/cache) under hood for caching dependencies and it follows the same behaviour as for [actions/cache](https://github.com/actions/cache) but requires less configuration settings. Supported package managers are gradle, maven and sbt. The format of the used cache primary key is `setup-java-${{ platform }}-${{ packageManager }}-${{ fileHash }}`, where the hash is based on the following files:
- gradle: `**/*.gradle*`, `**/gradle-wrapper.properties`, `buildSrc/**/Versions.kt`, `buildSrc/**/Dependencies.kt`, and `gradle/*.versions.toml`
- maven: `**/pom.xml`
- sbt: all sbt build definition files `**/*.sbt`, `**/project/build.properties`, `**/project/**.{scala,sbt}`

The workflow output `cache-hit` is set to indicate if an exact match was found for the key [as actions/cache does](https://github.com/actions/cache/tree/main#outputs).

The cache input is optional, and caching is turned off by default.
The cache input is optional, and caching is turned off by default. The action provides only a primary key.

For more information about cache please refer to [Official documentation](https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows)

#### Caching gradle dependencies
```yaml
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