If I understand you correctly, you have an application that you want to provide to people but you don't want to use your own hosted/cloud servers but serve it locally on the user's computer.
In that case, docker is not necessarily the answer but it could help. Ultimately, you will need to put everything in a simple to install script and let them run locally. Even if you want to package using docker, you will need to create a script that will auto setup docker if not already present and then run it.
I will create a script for windows, mac and Linux (if your users also use Linux). Then in the README, provide instructions how to run that install script. Let the script take care of all lower level things like docker etc.
In that case, docker is not necessarily the answer but it could help. Ultimately, you will need to put everything in a simple to install script and let them run locally. Even if you want to package using docker, you will need to create a script that will auto setup docker if not already present and then run it.
I will create a script for windows, mac and Linux (if your users also use Linux). Then in the README, provide instructions how to run that install script. Let the script take care of all lower level things like docker etc.