fix(frontend): Incorret build tag in workflow file

[aadil96]

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[what-the-diff]

PR Summary

• Update of Docker Image Tag in GitHub Actions Workflow
  This change updates the Docker image tag used in the GitHub Actions workflow. It has been changed from backend-app:latest to frontend-app:latest. This means that when we use our automated system for building and packaging our software (known as Docker image), we are directing it to use the latest version of the front end application, instead of the backend.