[Bug 47900] New: Enable caching of screenshots and log files

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=47900

Bug ID: 47900
           Summary: Enable caching of screenshots and log files
           Product: Wine-Testbot
           Version: unspecified
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

web/Screenshot.pl and web/GetFile.pl systematically disable caching of the
files they return by setting their Last-Modified field to the current time.

For Screenshot.pl this may have been to deal with live screenshots that were
updated regularly. But even so this should probably be done through the Expires
field instead. Anyway we don't have live snapshots anymore and when they come
back it will (most likely) be in the form of a timestamped filename so that
once written a file would not change.

The only case where a file may change is when a job is canceled and restarted.
That does not seem to warrant disabling caching altogether.