downloader: re-download digest-less cached images if last-modified differs
#3342
| Job | Run time |
|---|---|
| 3m 7s | |
| 1m 43s | |
| 4m 50s |
last-modified differs
#3342
| Job | Run time |
|---|---|
| 3m 7s | |
| 1m 43s | |
| 4m 50s |