Issue 22: Validate marketplace templates with JSON Schema on template publish

[Nanle-code]

Labels: enhancement, templates

Description:
Publishing templates should validate registry.json entry shape and required files.

Acceptance criteria:

Schema file under templates/.
template publish fails fast with actionable errors.
Files:

src/commands/template.rs
src/utils/templates.rs
templates/registry.json
New: templates/schema.json

[Eddy-star223]

@Eddy-star223 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I'm a Software Engineer with experience in backend engineering, DevOps, and Site Reliability practices, with hands-on work in Java (Spring Boot), Python (Django), Docker, Kubernetes, and cloud-native systems. While I'm still growing in open-source contributions, I'm a fast learner and genuinely interested in contributing to this issue.

My experience includes building and maintaining RESTful services, working with validation logic, configuration management, and scalable backend systems. I’m comfortable working with structured data formats, backend workflows, and implementing reliable validation mechanisms that improve developer experience and system stability.

A few projects I’ve worked on include:

• Password Management System - https://github.com/Eddy-star223/passwordManagementSystem

• Ecommerce Platform (EddyStore) - https://github.com/Eddy-star223/DjangoProject/tree/main/EddyStore

I’m comfortable navigating existing codebases, following project conventions, and writing clean, maintainable code. This issue particularly interests me because it combines validation, developer tooling, and backend reliability — areas I enjoy working on.

I’d love the opportunity to contribute to this issue. Thank you for considering me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Eddy-star223 to this issue.

[drips-wave]

Congratulations, @Eddy-star223! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @Eddy-star223: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊