Docker-compose volume permissions

[james-smith-za]

Not quite sure what the right way to phrase this in the docs is, otherwise I'd have made a PR with my own suggestion, so I'll describe the issue that I ran into and how I went about solving it.

I couldn't start up the service with podman compose up on Rocky Linux even after setting the PUID and PGID appropriately: permissions for the mounted directories. I think the issue is caused by SELinux.

I solved the problem by adding :z to the end of the lines describing the volumes, which in my understanding makes Docker indicate that the folder is shared: allowing the container to read from / write to it while preserving the same ability from the host.

I don't know whether adding that would be benign or problematic in other situations such as Ubuntu / Debian where you don't have SELinux enabled by default.

[james-smith-za]

Great project BTW, been using it for a few days now and loving it. Now that I've actually got it set up and working.