Add Render.com blueprint (render.yaml) for one-click deployment

[Copilot]

This PR adds a comprehensive Render.com blueprint configuration that enables one-click deployment of CodiMD on Render's cloud platform.

What's Added

A complete render.yaml file in the root directory that defines:

Web Service Configuration

• Runtime: Node.js with starter plan (cost-effective default)
• Build: npm install && npm run build
• Pre-deploy: npx sequelize db:migrate (handles database schema updates)
• Start: node app.js (direct execution for better control)
• Health Check: /status endpoint (enables zero-downtime deployments)

Database Configuration

• PostgreSQL: basic-256mb plan with version 14
• Security: Internal connections only (empty IP allow list)
• Auto-provisioning: Database created and configured automatically

Environment Variables (38 total)

• Production settings: NODE_ENV=production, build tools enabled
• Database connection: Secure reference via fromDatabase pattern
• Session security: Auto-generated secret with generateValue: true
• OAuth providers: All major providers (GitHub, GitLab, Google, etc.) with sync: false for secure credential prompting
• CodiMD settings: Complete configuration based on existing Heroku/Scalingo deployments

Key Benefits

✅ One-click deployment - Deploy CodiMD instantly on Render.com
✅ Automatic infrastructure - Database provisioning and migrations handled
✅ Security best practices - Secrets prompted during deployment, not hardcoded
✅ Zero-downtime deploys - Health check endpoint for rolling updates
✅ Cost effective - Starter tier configuration suitable for most users
✅ Production ready - Based on existing battle-tested deployment configurations

Validation

The blueprint has been validated for:

• YAML syntax and structure
• Render.com specification compliance
• All required fields and proper referencing
• Security configuration best practices

Usage

Users can now deploy CodiMD on Render.com by:

1. Forking this repository
2. Connecting it to Render.com
3. The blueprint will automatically provision and configure all necessary infrastructure

Fixes #1929.

[!WARNING]

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/jgm/pandoc/releases/tags/3.1.11
  • Triggering command: node download.js (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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