Gather license information for GitHub Actions

### Description

This is a request to support GitHub Actions.

### Criteria

Reference: [Adding a new Harvest Source](https://docs.clearlydefined.io/docs/get-involved/adding-sources#adding-a-new-harvest-source)

- **Discoverability** - The primary way to discover GitHub Actions is through the [Actions Marketplace](https://github.com/marketplace?type=actions).

- **Primary Source** - Yes, this is the primary source

- **Reputability** - GitHub supports actions and the marketplace and is committed to its long term viability.

- **Security** - Security for GitHub Actions is described in the official documentation [Security hardening for GitHub Actions](https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions)

- **Automation** - The repository does not have an API. Exploration is required to determine if the GitHub full API can be leveraged to get the required information or some other approach.

- **Relationship** - GitHub is requesting this support.