Add GitHub Actions CI/CD pipeline

[SagiEv]

Add GitHub Actions CI/CD pipeline

Goal

Automate quality checks and deployment through GitHub Actions.

CI

On pull requests and relevant pushes:

1. Install dependencies.
2. Run lint.
3. Run backend unit tests.
4. Run AI-service tests.
5. Run frontend tests.
6. Run integration tests.
7. Run E2E tests where appropriate.
8. Build the application.
9. Validate required schemas/configuration.

CD

Define deployment workflows for the project's existing environments.

Recommended environments:

• Development
• Staging
• Production

Production deployment should require appropriate protection/approval where applicable.

Requirements

• Cache dependencies where useful.
• Fail fast on critical errors.
• Store test reports/artifacts where useful.
• Do not expose secrets in logs.
• Use GitHub Secrets/environment variables for credentials.
• Pin action versions appropriately.
• Clearly identify CI vs deployment workflows.

Acceptance Criteria

• Pull requests automatically run CI.
• Failed tests block successful CI.
• Lint failures block CI.
• Build is validated.
• Deployment workflow exists for supported environments.
• Secrets are handled securely.
• Workflow documentation is added.