Add GitHub Actions for CI/CD Pipeline

[karademirmustafa]

Implement a GitHub Actions workflow to automate the CI/CD process. The workflow should include:

• Running tests on each pull request.
• Building the project to ensure no build errors.
• Deploying the API when changes are merged into the main branch.

Tasks:

• Create a .github/workflows directory.
• Add a ci-cd-pipeline.yml file.
• Configure steps for testing, building, and deploying.
• Ensure proper secrets management for deployment.