Runtime type-check error for workflow_dispatch runs

[behnam-oneschema]

When running my ci workflow with a manual dispatch, get this

Context

Step's details:

Run stoplightio/spectral-action@latest
with:
file_glob: docs/[...].yaml
repo_token: ***
event_name: workflow_dispatch

## Current Behavior

Error: member 0
└─ required property "pull_request"
└─ cannot decode undefined, should be Record<string, unknown>
member 1
└─ required property "after"
└─ cannot decode undefined, should be string

## Expected Behavior
No errors, like the action runs from PRs and pulls.


## Possible Workaround/Solution
It looks like extending this runtime type to not expect a `pull_request` field all the times should do the job:
https://github.com/stoplightio/spectral-action/blob/6416fd018ae38e60136775066eb3e98172143141/src/octokit.ts#L25-L39

## Steps to Reproduce
Create a workflow with:

name: ci
on:
push:
workflow_dispatch:

and use this to run this action.

- Version used: `latest`