ci: add openssf scorecard gh action

[inigomarquinez]

Description

Add a new GitHub action to generate the OpenSSF scorecard for this repository.

After adding this action, we'll need to update the file in the maintainers repo listing all the tracked repositories (see here).

Related Issue

Closes #86

Motivation and Context

The intention is to track all the active repositories in the OneBeyond's GitHub organization with the OpenSSF Scorecard so we can better maintain them and see their health.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.