Github Actions Security Hardening

[muhammad-st]

Overview

This pull request updates the GitHub Actions workflow configuration to improve security, reliability, and maintainability for Ruby tests. The most important changes are grouped below:

Security improvements:

• Restricted default workflow permissions to contents: read to minimize potential security risks.
• Disabled credential persistence on the checkout step to prevent accidental leaking of credentials.

Workflow reliability:

• Added a concurrency group to prevent duplicate workflow runs and automatically cancel in-progress runs for the same branch or pull request.

Maintenance:

• Updated the actions/checkout step from version 3 to version 4 for improved performance and support.
• Added a descriptive job name Ruby Tests for clarity in workflow runs.

Related tickets

• https://github.com/sensortower/overseer/issues/44443

Stakeholders

• @st-misha
• @miltonyates-st
• @kacperkaminski-st