Skip inaccessible directories and don't fail

[nafg]

When run in a directory that contains inaccessible files it crashes.

For instance in a few projects my docker-compose.yml mounts Postgres' data directory in ./docker/.pgdata. This gets ownership of some other UID. This is what happens when I try running it:

❯ /tmp/sup-linux-amd
timestamp=2022-07-14T21:37:35.095582Z level=ERROR thread=#zio-fiber-0 message="" cause="Exception in thread "zio-fiber-" java.nio.file.AccessDeniedException: java.nio.file.AccessDeniedException: /home/naftoli/repositories/gitlab.com/mikvahbook/app/docker/.pgdata
"
``