v6.0.0

Changes

• Take into account job name and matrices by default. (Previously, one has to pass those manually via extraKey: …)
• Better cache key pattern, like ${cacheType}-${jobName}[-${matrix}]-${hash}, favoring re-use of more relevant previous caches
• Better output overall: the action now prints the cache keys it looks into, whether a cache hit occurred on the main key, whether the cache should be persisted in post run job, the used to persist the cache in the post run job, etc.