Containers on MacOS are ran inside a Linux VM. If you ensure that the Linux VM doesn't have access to anything besides the required files/networks, that should be pretty secure.
Best case you go through the settings of Docker, Podman or whatever you use to limit integrations. Then, from within the VM and container see what networks, files, etc. you can reach to be sure.
Best case you go through the settings of Docker, Podman or whatever you use to limit integrations. Then, from within the VM and container see what networks, files, etc. you can reach to be sure.