Config as Code: version-controlled config with CI/CD

[zeevdr]

Advanced demo: manage config as code in git, validate in CI, promote across environments.

Uses decree CLI tools (seed, validate, diff) to show a production-grade workflow.

• docker-compose.yml
• Config files in git
• CI-like validation script
• Promotion workflow walkthrough
• test.sh for CI validation

Part of opendecree/decree#30.

[github-actions]

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