hello, I'm starting with docker containers and I managed to get an application, the problem I have is that I have to access a file that is in /var/APP/secrets/initialadminpassword but that path does not exist, I want to know how I find out the paths to the files of the container

Thank you

Did you do any research at all? Putting "how to access files in a docker container on Linux" into Google pulls up many articles, like this one:
https://askubuntu.com/questions/1372...n-ubuntu-20-04

Read the "Question Guidelines" (as you've been asked before), and provide details/do research when asking a question.

If I searched and after searching a lot I asked here, but in the link you send me it still doesn't help me, I can't find where the application configuration files are

Then there is nothing we can help you with. You were handed a link that explicitly tells you how to mount the Docker container...from there, go INTO that mount point. And again, you only say "can't find where"...but don't tell us exactly what you did, what the results were, how you looked, etc. We still cannot guess.

If the link that had to be looked up for you didn't help, then you probably should either:

1. Look up things for yourself.
2. Post a a clear question with details about what typed in, etc., so someone can help from there.

As it is, it appears you did no research of your own, and somehow expect folks here to be able to tell you exactly what to do, when we have no details. Did you actually read that entire page, or just look at the top?? Might want to read the part that starts with: "Normally, you can't find your container's files on your hard drive. If you want to browse the files, you need a shell inside the container:", and has other info there.

Container technologies commonly use "user-mounted file systems" in which the data is actually stored in large physical files which have a filesystem-like internal structure. This is not the only way to do it, but it is a common way, partly so the host's own filesystem does not get too messy. You have to go into the container environment to see the "files." (Well, there are "host-side utilities" ...)

You need to provide exact details in order to get a meaningful answer, as there are too many possibilities for anyone to "speculate" as to what your situation is.