@sdv43 This is not a blocker, but consider making the location of Docker socket configurable. For example, I run dockerd unprivileged, so the file is at /run/user/1000/docker.sock on my system, but Fedora/podman users are likely to have it at either /run/user/1000/podman/podman.sock or /run/podman/podman.sock. The /run/user/1000 part can be grabbed through the $XDG_RUNTIME_DIR environment variable and should be accessible if you add something along --filesystem=xdg-run/podman (etc).
https://github.com/flathub/flathub/pull/3094#issuecomment-1118290663