Implement CI/CD Pipeline with GitHub Actions

### Description

**Priority:** Medium
**Type:** Developer Experience
**Dependencies:** Implement Docker Compose for Local Development

**Description:**
The application lacks a modern CI/CD pipeline for automated testing, building, and deployment. Implementing a GitHub Actions workflow will improve code quality and deployment reliability.

**Acceptance Criteria:**
- [ ] Create a GitHub Actions workflow for CI/CD
- [ ] Configure build and test automation
- [ ] Set up code quality checks (SonarQube, PMD, etc.)
- [ ] Implement security scanning for dependencies and code
- [ ] Configure Docker image building and publishing
- [ ] Set up environment-specific deployments
- [ ] Document the CI/CD pipeline

**Technical Notes:**
A robust CI/CD pipeline is essential for maintaining code quality and enabling frequent deployments. Use GitHub Actions' matrix feature to test against multiple Java versions and environments. Consider implementing a multi-stage deployment process with separate workflows for development, staging, and production environments.