[request] want a feature that loads secret information at runtime from a file and further guards the information against disclosure

Currently without own efforts, secret information like login names and passwords are in the script as readable strings.

There should be a feature, to define secret information as such, so that it can be used in the script without showing it.
Furthermore the usage of secret information itself should not show up in any logging and should not be sent over the net in any way.

The usual workaround is to load the secret information from a file, that is separate and not part of the script container.
Besides some boiler plate code, this does not secure the information being shown in logging or revealed in other ways.