packer validate -var-file=config.json windows_server2019_proxmox.json
packer build -var-file=config.json windows_server2019_proxmox.json
apt update apt -y install apt-transport-https ca-certificates curl software-properties-common curl -fsSL https://apt.releases.hashicorp.com/gpg | sudo apt-key add - apt-add-repository "deb [arch=amd64] https://apt.releases.hashicorp.com $(lsb_release -cs) main" apt update apt install packer
download here : https://cloudbase.it/cloudbase-init/
put the msi at : /proxmox/packer/scripts/sysprep/CloudbaseInitSetup_1_1_2_x64.msi (54,7M)