The current Windows CI setup script assumes it will always be run under
the `azureuser` username.
While this username is defined in the Windows CI GitHub action, the
current version of the script both exposes us to a future risk of
breaking should the CI action be changed, and is also unfriendly to
`curl | sh`-ing it for quick test environment setups.
This patch makes the Windows CI setup script work with any username
provided they have administrative privileges.
Signed-off-by: Nashwan Azhari <nazhari@cloudbasesolutions.com>