Add VSCode extension for YAML schema scaffolding and validation

[Copilot]

Implements a VSCode extension that scaffolds YAML configuration files from templates and validates them against custom JSON schemas in real-time.

Implementation

Extension Commands

• Scaffold YAML File: Creates new YAML files from predefined DevOps configuration template
• Validate YAML File: Manual validation trigger with AJV-based JSON Schema Draft 07 validation

Auto-validation

• Triggers on save for files matching DevOps patterns (*devops*, *config*, *-config.yaml)
• Clears diagnostics per-document to avoid cross-file interference
• Attempts line-number positioning via YAML path parsing

Schema System

• Default .devops-schema.json with services, databases, health checks
• Configurable schema path via devopsPowertools.schemaPath workspace setting
• Supports application metadata, port ranges, semver validation, enum constraints

VSCode Integration

• Diagnostics collection initialized in activate(), disposed in deactivate()
• Errors reported to Problems panel with severity and line positioning
• Extension activates on YAML language files

Example

name: my-app
version: 1.0.0
environment: production

services:
  - name: api
    port: 8080
    replicas: 3
    healthCheck:
      enabled: true
      path: /health
      interval: 30

database:
  type: postgresql
  host: db.example.com
  port: 5432
  name: prod_db

Schema validates:

• Semver pattern for version
• Enum constraints (environment: dev/staging/prod, database type)
• Port ranges (1-65535)
• Required fields (name, version, environment)

Security Summary

No vulnerabilities detected (npm audit, CodeQL).

Original prompt

a vscode extension to scaffold a yaml file with my custom schema for my app and validate schema files in the current project

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