Add GitHub Actions CI workflow for automated testing

[AdekunleBamz]

This pull request introduces a GitHub Actions CI workflow to automate the testing and validation process for the Eventura project. The workflow is triggered on pushes and pull requests to the main branch, ensuring code quality and reliability.

Changes Made:

• Added .github/workflows/ci.yml with a CI pipeline that:
  • Sets up Node.js 18 with npm caching
  • Installs project dependencies
  • Executes the test suite with npm test

Benefits:

• Automated testing prevents regressions
• Provides quick feedback on code changes
• Improves overall project reliability and contributor confidence

This enhancement aligns with best practices for open-source projects and will help maintain code quality as the Base blockchain event ticketing platform evolves.