Which system are you using? SELinux/AppArmot active? Can you share your compose? There are manyavariables at play here.
Other than that: Setting UID/GID via environmental variable is usually wrong, mostly from a design perspective of the container. There is a user directive during build as well as during deploy to use for that.
From a quick look at the docker file it does look like the user you use to run linkding needs to be in the root group.
BUT rootless podman maps the root user (usually to your user ID) to so the root user inside the container has not the same ID as the one outside. So I would suggest setting the permissions of the volume to your user for now.
Another way to figure out which user to use: just start a new/clean instance of the service and look at the new volumes.







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