This pull request introduces a GitHub Actions workflow for automated deployment, improves the Lambda layer build process, and updates TypeScript build configuration to exclude infrastructure code. The changes streamline CI/CD and ensure a cleaner build output.

CI/CD Automation:

• Adds a new GitHub Actions workflow (.github/workflows/deploy.yml) to automate deployment of the CDK stack on pushes and pull requests to the main branch. This workflow checks out code, sets up Node.js, installs dependencies, builds the application and Lambda layer, configures AWS credentials, installs CDK dependencies, and deploys the CDK stack.

Build Process Improvements:

• Updates the build:lambda-layer script in package.json to ensure the layer/nodejs directory exists before copying files, preventing potential build errors.

TypeScript Configuration:

• Modifies tsconfig.build.json to explicitly set the rootDir and exclude the infra directory from the build, ensuring that infrastructure code is not included in the compiled output.