Allow deletion after copy only on writable buckets

added S3Bucket bug labels

assigned to @daniel.goebel

created branch bugfix/126-allow-deletion-after-copy-only-on-writable-buckets to address this issue

mentioned in merge request !123 (merged)

mentioned in commit 6d383e42

mentioned in commit 2f9dbf93

closed with merge request !123 (merged)