HTTPS support on WIMBOOT

[NiKiZe]

This is not related to wimboot in any way (wimboot just loads what is available in memory)

To have https support in iPXE you have to enable DOWNLOAD_PROTO_HTTPS as described at https://ipxe.org/crypto
The error url in the message you got have some other https related information in case you already have HTTPS enabled - and that information fits quite good with you mentioning adding a certificate during build.