fix: skip dirs with no permissions for release-1.0 #841

Job	Run time
sync-to-gateway-with-multithread	5m 54s
upload-big-files-with-etcd	5m 50s
upload-big-files-with-badgerdb	3m 53s
upload-big-files-with-mariadb-read-committed	7m 3s
upload-big-files-with-mysql-read-committed	7m 25s
upload-big-files-with-mysql-read-uncommitted	7m 28s
upload-big-files-with-mysql-repeatable-read	4m 3s
upload-big-files-with-mysql-serializable	7m 9s
upload-big-files-with-pg-read-committed	7m 25s
upload-big-files-with-pg-repeatable-read	9m 28s
upload-big-files-with-pg-serializable	4m 32s
upload-big-files-with-sqlite	6m 15s
upload-big-files-with-tidb-repeatable-read	17m 49s
upload-big-files-with-tidb-read-committed	23m 48s
upload-big-files-with-tikv	5m 27s
upload-big-file-with-redis	5m 8s
upload-small-files-with-badgerdb	4m 18s
upload-small-files-with-etcd	5m 17s
upload-small-files-with-mysql-read-committed	7m 37s
upload-small-files-with-mysql-read-uncommitted	9m 25s
upload-small-files-with-mysql-repeatable-read	7m 37s
upload-small-files-with-mysql-serializable	9m 15s
upload-small-files-with-pg	9m 53s
upload-small-files-with-redis	5m 59s
upload-small-files-with-sqlite	9m 5s
upload-small-files-with-tikv	6m 7s
	3h 23m 10s

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