Update entrypoint to add workspace as safe directory

[FarzamMohammadi]

Pull request summary

• Prevents "fatal: unsafe repository ('/github/workspace' is owned by someone else" - https://github.com/actions/checkout/issues/760)" error caused by PRs.
• Implements git configuration to set the workspace as a safe directory.

Additional information

• Solution source: https://github.com/actions/checkout/issues/766

  Pull request checklist

• [X] Have you followed the guidelines in our Contributing document?
• [X] Have you checked to ensure there aren't other open Pull Requests for the same change?
• [X] Have you added an explanation of what your changes do and why you'd like us to include them?
• [X] Have you written new tests for your changes?
• [X] Have you successfully tested your changes locally?

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[Marusyk]

@zbeekman

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[Marusyk]

@zbeekman is there a chance to merge it?