wiping nexus3 docker images

docker-staging-cleanup.groovy

import org.sonatype.nexus.repository.storage.StorageFacet

def dockerRepository = repository.repositoryManager.get('docker-staging')
def dockerBlobStore = blobStore.blobStoreManager.get(dockerRepository.configuration.attributes.storage.blobStoreName)
def storageTx = dockerRepository.facet(StorageFacet.class).txSupplier().get()
try {
    storageTx.begin()
    dockerRepository.stop()
    def bucket = storageTx.findBucket(dockerRepository)

    def images = storageTx.browseComponents(bucket).asCollection().asImmutable()
    log.info("Nexus Components - Docker Images: ${images.size()}")
    images.forEach { component ->
        storageTx.deleteComponent(component)        
    }
    
    storageTx.browseAssets(bucket).forEach { asset ->
        storageTx.deleteAsset(asset)
    }
    storageTx.commit()
    dockerBlobStore.compact()
} finally {
    dockerRepository.start()
    storageTx.close()
    log.info("Dangling cleanup done")
}