Add CI/CD pipeline for backend, frontend, and ZK components

[Josie123-Dev]

What

Extend .github/workflows/ci.yml (or create separate workflow files) to run automated build, lint, and test checks for the backend (NestJS), frontend (Next.js), and ZK (Circom/SnarkJS) components on every push and PR to main.

Why

Currently only the Soroban smart contracts have CI. The backend has 22 spec files that never run in CI. The frontend has 4 test files and a build step that are never verified. The ZK circuits have 5 test files that are never compiled or tested automatically. This means regressions in 3 out of 4 project components can merge without any automated check.

Scope

In scope:

• Add a backend CI job: install deps, lint, build, run unit tests, run test:cov
• Add a frontend CI job: install deps, lint, build, run tests
• Add a zk CI job: install deps, compile circuits, run tests
• Add dependency caching (node_modules) for all JS jobs
• Add a status check matrix so all 4 jobs must pass

Out of scope:

• Deployment automation (separate issue)
• Docker image building (separate issue)
• Coverage reporting to external services (separate issue)

Acceptance Criteria

• All 4 components (contracts, backend, frontend, zk) have CI jobs
• Each job runs on push to main and on PRs targeting main
• Backend job: npm run lint, npm run build, npm run test
• Frontend job: npm run lint, npm run build, npm test
• ZK job: circuit compilation + npm test
• All jobs use dependency caching for faster runs
• PR merge requires all 4 jobs to pass (configure branch protection after merging)

Technical Context

• Existing CI: .github/workflows/ci.yml (contracts job only)
• Backend: backend/package.json has lint, build, test, test:cov scripts
• Frontend: frontend/package.json has lint, build, test scripts
• ZK: zk/package.json has compile, test scripts; Circom 2.0+ needs to be installed
• Use actions/setup-node@v4 with node-version 20 for JS jobs
• ZK circuit compilation needs Circom binary — use iden3/circom action or install from release

[DevSolex]

Hi Maintainer,

I’m a smart contract and full-stack developer and would love to contribute to this issue. I’m an experienced contributor with hands-on expertise in Rust, Soroban, Cairo, and TypeScript.

I’m passionate about building secure, scalable blockchain solutions, with a strong emphasis on writing clean and maintainable code. Based on the scope of this issue, I’m confident I can deliver a complete solution within 24 hours of assignment.

I’d greatly appreciate the opportunity to contribute and help move this forward.

[GiftedGiftB]

I can get this work done in less than 24 hours.

[rupesh-kumar-sah]

Hi everyone,

I can tackle Add CI/CD pipeline for backend, frontend, and ZK components. Proposed implementation roadmap:

• Analysis: Inspect current behavior and edge cases in GuardZero144/ValidFi
• Core Implementation: Build Add CI/CD pipeline for backend, frontend, and ZK components with clean React/Next.js components, responsive styling, and proper loading/error boundaries.
• Quality Assurance: Add component unit tests and ensure zero TypeScript/ESLint warnings.

I am ready to start immediately—please assign this to me!