It started today, but all of the promotion jobs are failing with this error:

```
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed

0 0 0 0 0 0 0 0 -::- -::- -::- 0
0 0 0 0 0 0 0 0 -::- -::- -::- 0
gzip: stdin: unexpected end of file
tar: Child returned status 1
tar: Error is not recoverable: exiting now
```

Example: https://prow.ci.openshift.org/view/gs/origin-ci-test/logs/promote-release-openshift-machine-os-content-e2e-aws-4.12/1560203655653625856

4.12 job analysis: http://sippy-prow.dptools.openshift.org/sippy-ng/jobs/4.12/analysis?filters=%7B%22items%22%3A%5B%7B%22columnField%22%3A%22name%22%2C%22operatorValue%22%3A%22equals%22%2C%22value%22%3A%22promote-release-openshift-machine-os-content-e2e-aws-4.12%22%7D%5D%7D