Users relying on an external mechanism to save/restore Gradle User Home
(e.g. Develocity Artifact Cache) previously had to set cache-disabled:
true, which is confusing since caching isn't actually disabled — it's
just not managed by this action — and the Job Summary misleadingly
reported caching as "Disabled".
cache-provider: external skips Gradle User Home restore/save (same as
cache-disabled) but reports a distinct "External" status in the Job
Summary, explaining that caching is handled by another provider.
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Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
