Creating a new store in a directory that only contains hidden files throws an error

```
  2023-06-24T17:01:16.842563Z ERROR flick_sync_cli: .DS_Store exists in a potential new store
    at packages/cli/src/main.rs:115

  2023-06-24T17:01:16.842702Z ERROR flick_sync_cli: New store is not empty
    at packages/cli/src/main.rs:153
```
