WiP: fix environs tests on windows

Unfortunately, permission checking on Windows does not work as expected. For example, doing a:

```go
os.Chmod("C:/test.txt", 0600)
```

will set permissions to:

```
-rw-rw-rw-
```
tried it. On windows the separator is "\", and when passing that to a regex string:

```
`file ".*\my-name-private-key.pem" is empty`
```
it will fail with "Unknown escape sequence \m". Any idea how to get passed that cleaner?