Content-Type hard-coded to application/octet-stream for LFS design images
We've noticed two strange things recently:
1. The raw `job.log` (e.g. click on the `Show complete log` icon at the top) shows this `Content-Type: invalid/invalid`:

This causes the `job.log` to be downloaded as an attachment instead of a raw text file inside the browser.
2. As @.luke mentioned in https://gitlab.com/gitlab-org/gitlab/-/issues/34279/#note_303545297, SVG images within `<img>` tags appear as broken images because the `Content-Type` is `application/octet-stream` instead of `image/svg+xml`. You can see this in https://gitlab.com/gitlab-org/gitlab/-/issues/34279/designs:

In my GDK with my own GCS bucket, I don't see these issues, so I'm wondering Cloudflare or something else is altering the `Content-Type` values.
issue