in #25884, it was pointed out that the standard detection used to
determine the artifact's file type can be wrong. in those cases, it
would be handy for the user to be able to override the media type of the
layer. as such, added a new option called `--file-type`, which is
optional, and allows users to do just that.
`podman artifact add --file-type text/yaml
quay.io/artifact/config:latest ./config.yaml `
Fixes: #25884
Signed-off-by: Brent Baude <bbaude@redhat.com>
fdfed9979f