[INFRA] Standardize variable management (issue #15) #2

	# =============================================================================
	# validate-config.yml — Validate config/variables.example.yml against schema
	# =============================================================================
	# Triggered on PRs and pushes that touch config/ or this workflow.
	# Validates YAML syntax and JSON Schema compliance.
	# =============================================================================

	name: Validate Configuration

	on:
	push:
	branches: [main]
	paths:
	- 'config/**'
	- '.github/workflows/validate-config.yml'
	pull_request:
	branches: [main]
	paths:
	- 'config/**'
	workflow_dispatch:

	permissions:
	contents: read

	jobs:
	validate:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout repository
	uses: actions/checkout@v4

	- name: Setup Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.12'

	- name: Install dependencies
	run: pip install pyyaml jsonschema

	- name: Validate variables.example.yml against schema
	run: \|
	python3 -c "
	import yaml, json, sys
	from jsonschema import validate, ValidationError

	with open('config/variables.example.yml') as f:
	data = yaml.safe_load(f)

	with open('config/schema/variables.schema.json') as f:
	schema = json.load(f)

	try:
	validate(instance=data, schema=schema)
	print('✅ config/variables.example.yml passes schema validation')
	except ValidationError as e:
	print(f'❌ Schema validation failed: {e.message}')
	print(f' Path: {\" > \".join(str(p) for p in e.absolute_path)}')
	sys.exit(1)
	"

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