Feature Request: lint directory

### Feature request

Hi, Since usually we have multiple Kubernetes manifest for a project ( Deployment, Service, Configmap ... ) . It would be great if we could also specify a directory of the manifests when linting

Example action.yaml file
```
- uses: azure/k8s-lint@v1
with:
manifests: |
kubernetes/*
```

```
/home/runner/work/_temp/56c63f42-beac-4e20-8df8-3eee92e0b1d7/kubeval kubernetes/*
ERR - Could not open file kubernetes/*
```

Start with action.yaml and reproduce the shown kubeval command using the kubernetes/* manifest pattern. Trace how the manifests input reaches kubeval; done means a directory or glob such as kubernetes/* is accepted and each matching Kubernetes manifest is linted.

Written by the indexing model from the issue text.