ERROR: There are ZERO commit to release! is thrown when doing a very first release of a package

### Prerequisites

- [X] I have written a descriptive issue title
- [X] I have searched existing issues to ensure the bug has not already been reported

### Fastify version

x

### Plugin version

x

### Node.js version

16

### Operating system

Linux

### Operating system version (i.e. 20.04, 11.3, 10)

Ubuntu 21.04

### Description

https://github.com/fastify/releasify/blob/e279753300d75f2656837aad07a3a468b4ba91e0/lib/commands/publish.js#L88

### Steps to Reproduce

try to make a very first release of some package by calling
```
releasify publish
```

for example you can check out this one:
https://github.com/nearform/mercurius-apollo-tracing/tree/bab75dee4988e47b0ee776ca21dab1a6f07edc0b

### Expected Behavior

No error is thrown, package get's published

Start at lib/commands/publish.js#L88 and reproduce the failure with `releasify publish` on the mercurius-apollo-tracing example package. Trace how a package with no prior release is handled, then verify that its first release publishes successfully without the zero-commits error.

Written by the indexing model from the issue text.