This workflow updates the *.json files in the examples/v3.0 directory,
when the corresponding *.yaml files change.
JSON example files are automatically generated from the YAML example
files.
Only the YAML files should be adjusted manually.

fixes OAI#1385

- When a push to `master` (or any other branch we wish to include) is
made, a Github Actions Workflow is triggered
([example](https://github.com/cebe/OpenAPI-Specification/commit/9c98e819ae876af92c2a9112dcfa6dfcb929e7dc/checks?check_suite_id=331067708))
- it will generate new JSON files from the YAML examples
- if there are any changes, it will create a pull request to the branch
that triggered the Workflow
([example](#3))