nixguix: Improve further tarball detection
The current content type detection was a bit off mostly for content which includes charset. This commit fixes it.
Related to T3781
Migrated from D8624 (view on Phabricator)
The current content type detection was a bit off mostly for content which includes charset. This commit fixes it.
Related to T3781
Migrated from D8624 (view on Phabricator)