Avoid capturing build-results for cache cleanup

The Gradle build used to perform cache-cleanup will run in the context of init-scripts
provided by the action, including those that collect build-results.
In some circumstances this can lead to unexpected results, such as saving configuration-cache
entries for cache cleanup executions.

With this change, build results will not be captured for cache-cleanup builds.

sources/src/caching/cache-cleaner.ts

@@ -75,6 +75,7 @@ export class CacheCleaner {
             '--no-scan',
             '--build-cache',
             '-DGITHUB_DEPENDENCY_GRAPH_ENABLED=false',
+            '-DGRADLE_ACTIONS_SKIP_BUILD_RESULT_CAPTURE=true',
             'noop'
         ]