Add "--no-overwrite-dir" to "tar" invocation for running as an arbitrary user #351
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This fixes
tar: .: Cannot utime: Operation not permitted
andtar: .: Cannot change mode to rwxr-xr-x: Operation not permitted
(which we get currently).This combined with docker-library/php#755 fixes part of what @wglambert noted in docker-library/php#754 (comment).