Compress and encrypt the image when uploading and storing the image in glance

When we make a qcow2 image and prepare to upload it to glance,the image usually be large and can be compress,so it's better to compress the image in the client side and upload the compressed image to glance,which will save much store space.
compress wiki--https://pve.proxmox.com/wiki/Shrink_Qcow2_Disk_Files

Also,the image store is not safe in glance,if someone can access the directory,he can get the image file and steal the information of the image,so we'd better encrypt the image(use libvirt,https://libvirt.org/formatstorageencryption.html).