SolusIO image builder gets stuck

Symptoms 

SolusIO image builder (https://github.com/plesk/solus-cloud-images) gets stuck at:

CONFIG_TEXT: ===> Build windows server 2019 cloud-base-init image

Cause

/usr/sbin/packer binary was not replaced.

Resolution

1. Connect to CR via SSH
2. Replace the packer:

   # wget https://releases.hashicorp.com/packer/1.5.1/packer_1.5.1_linux_amd64.zip
   # unzip packer_1.5.1_linux_amd64.zip
   # mv /usr/sbin/packer{,.orig}
   # cp packer /usr/sbin/