FreeBSD in Azure within CSP subscriptions

Hi,

we're trying to run some FreeBSD VMs in Azure, but found that we're
not able to deploy the official FreeBSD marketplace images into CSP
subscriptions. There seems to be a specific flag missing in the image
publishing process. I've set this up for other marketplace offers, so
I'd gladly help to get this sorted out.

I've been trying to build my own images for Azure as a workaround, but
couldn't get this to work either unfortunately (probably due to my
lack of experience with the entire FreeBSD build ecosystem).

Thanks,
Severin