User specific site access without editing YAML files

Hello Grav community,

i want to built a website where I pregenerate user accounts and give them access to only a specific range of sites (A folder where videos are stored and a folder / site where I write texts for them). As my grav is hosted as Docker container I don't have easy access to the yaml files and would prefer not to use them. Is there any solution for my very specific problem?

Thanks in advance
Robin

How would you generate accounts if you don't have access to files?

can you better explain why access to yaml files inside a docker container is a problem ?
(editing files inside a docker container is easy, as well as creating them outside and then copy them into the container).
and what do you mean exactly with 'pregenerate user accounts' ?
(create the accounts in the grav admin backend, or create/edit yaml files independently and then copy those into the container ?).
or is your problem the docker container hosted somewhere and you have no possibility to directly modify it ?