S3 sync missing files

[shankerwangmiao]

tunasync-scripts/s3.sh

Line 5 in d5f2142

exec aws --no-sign-request --endpoint-url="${TUNASYNC_S3_ENDPOINT}" s3 sync ${TUNASYNC_AWS_OPTIONS} "${TUNASYNC_UPSTREAM_URL}" "${TUNASYNC_WORKING_DIR}"

ref: tuna/issues#910

The last modify time of py3/redhat/8/x86_64/latest/repodata/repomd.xml on our server is May 4, and is Aug 14 according to the headers of the file in question.

[shankerwangmiao]

ref: tuna/issues#945

[shankerwangmiao]

ref: tuna/issues#1029

[shankerwangmiao]

Reopen since --exact-timestamp is not compatible with non-aws s3 implementations which have more precise resolution of last modified timestamp.