Test profile import needs to support old archive files that otherwise are rejected

[isoos]

Currently the following test profile will fail to import, as retry 3.1.0's archive have mode bits in the tar headers that are not 644 (rather IIRC 640). This is an archive check that was introduced after retry 3.1.0 was published.

packages:
  - name: retry
    versions: ['3.1.0', '3.1.1']

We should probably have an extra flag to support sidestepping all or selectively ignoring some of the checks we do at upload time, otherwise we can't easily import such old archive versions into a test profile.

[isoos]

For the specific issue that prevented the above test profile, I think the easiest way to resolve it would be to re-package the archive with the correct mode bits. Other archive issues may be corrected similarly, without the need of propagating a flag through the entire process that may skip the checks during the upload.