Update Upload Server Users from Beekeeper

This is script updates an upload server's users based on nodes in a Beekeeper. It is primarily intended to be run as a cronjob.

This script expects the following env vars as configuration:

• BEEKEEPER_STATE_ENDPOINT: Endpoint for Beekeeper state API.
• BEEHIVE_NAME: Name of Beehive.
• UPLOAD_SERVER_HOST: Beehive's upload server host.
• UPLOAD_SERVER_PORT: Beehive's upload server port.
• UPLOAD_SERVER_USER: Beehive's upload server user.
• UPLOAD_SERVER_KEY: Path to Beehive's upload server key.

Additionally, the script requires the following ssh configuration:

• An ssh key pair must be mounted at UPLOAD_SERVER_KEY for authentication with the upload server.
• A known_hosts file must be mounted at either /etc/ssh/ssh_known_hosts or /root/.ssh/known_hosts with an entry for the upload server.