Potential fix for code scanning alert no. 26: Workflow does not contain permissions

[AndresMaqueo]

Potential fix for https://github.com/AndresMaqueo/codeql-coding-standards/security/code-scanning/26

To fix the problem, we should introduce a permissions: block in the workflow file, specifying minimal privileges required by the jobs. As neither of the jobs performs any write operations (e.g., creating or modifying issues, releases, pull requests, etc.), specifying contents: read is sufficient. The permissions: block may be placed at the root of the workflow file to apply to all jobs, unless a job requires different permissions. For this file, we should add the following lines directly after the workflow name, before the on: triggers, i.e., after line 1:

permissions:
  contents: read

No additional libraries, methods, or definitions are required for this change.

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Pull Request Overview

This PR addresses a security code scanning alert by adding explicit permissions to a GitHub Actions workflow. The change follows security best practices by specifying minimal required permissions instead of relying on default permissions.

• Added minimal permissions: contents: read to the workflow file
• Addresses code scanning alert github#26 regarding missing workflow permissions
• Follows security best practice of explicit permission specification

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