fs-verity signing
=================
With a key pair, fs-verity signature can be generated by simply running
`fsverity` command line tool from
[fsverity-util](https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/fsverity-utils.git).

```
fsverity sign test.data test.data.fsv_sig --key=key.pem --cert=cert.pem
```