OpenAPI Check Workflow (Annotations) not working correctly

The [OpenAPI check](https://github.com/bundesAPI/api-doc-template/blob/main/.github/workflows/openapi_check.yaml) is currently not working correctly.

The annotations which show warnings or errors for the openapi file are sometimes not added at all or sometimes just added to another workflow run.

See: https://github.com/stoplightio/spectral-action/issues/646

Maybe we have to fix the action by ourself since it looks like stoplight does not work on the github action anymore.

We should also think about testing both (or all) openapi files if they exist.

Comienza con .github/workflows/openapi_check.yaml y compara su comportamiento con el issue #646 vinculado de stoplightio/spectral-action. Confirma cómo se adjuntan las anotaciones a las ejecuciones del workflow y, a continuación, verifica que las advertencias y los errores aparezcan en la ejecución correcta y que se comprueben ambos o todos los archivos OpenAPI cuando estén presentes.

Escrito por el modelo de indexación a partir del texto del issue.