Enable SSH Password Authentication Before Copying Public SSH Keys

[med-hedi-bra]

Issue: SSH Key Copy Step Fails Due to Disabled Password Authentication

In the document 03-compute-resources.md, it is stated that we should allow root SSH login and then copy the generated public SSH key to all VMs.

However, based on current default system configurations, this step does not work as expected because SSH password authentication is disabled by default

As a result, when attempting to copy the public SSH key to the VMs, the connection fails with a "Permission denied" error, since password-based authentication is required for the initial key installation.

To fix this, I believe the documentation should be updated to explicitly enable SSH password authentication before running the SSH key copy command, so that users are prompted for the VM password during this step.

I have opened a Pull Request to address this issue and update the documentation accordingly: #927