Use monolithic cache for Gradle User Home

- Do not restore cache when GUH exists
- Include RUNNER_OS in the cache key
- Do not save cache on exact hit
- Only save cache in the final post action
- Log before saving cache

src/post.ts

@@ -1,16 +1,12 @@
 import * as core from '@actions/core'
 
-import * as cacheWrapper from './cache-wrapper'
-import * as cacheDependencies from './cache-dependencies'
-import * as cacheConfiguration from './cache-configuration'
+import * as cacheGradleUserHome from './cache-gradle-user-home'
 
 // Invoked by GitHub Actions
 export async function run(): Promise<void> {
     if (isCacheReadOnly()) return
 
-    await cacheWrapper.cacheWrapperDist()
-    await cacheDependencies.cacheDependencies()
-    await cacheConfiguration.cacheConfiguration()
+    await cacheGradleUserHome.save()
 }
 
 function isCacheReadOnly(): boolean {