Fix PostgreSQL SSL configuration in nextjs-postgres sample

[Copilot]

The nextjs-postgres sample was failing to deploy due to a PostgreSQL SSL configuration mismatch. The deployment logs showed:

Error: The server does not support SSL connections

Root Cause

The production compose.yaml had POSTGRES_SSL: true but the standard postgres:16 Docker image doesn't have SSL configured by default, causing the connection to fail.

Changes Made

1. Fixed SSL Configuration: Changed POSTGRES_SSL from true to false in compose.yaml to match the reality that the PostgreSQL container doesn't support SSL connections
2. Added Documentation: Updated README.md to explain database SSL configuration options for users who might need SSL with managed databases

Testing

• ✅ Next.js application builds successfully
• ✅ SSL configuration logic validated with test cases
• ✅ Docker Compose configurations validated for both production and development
• ✅ Development configuration unchanged (still uses POSTGRES_SSL: "")

The fix is minimal and surgical - only one line changed in the core configuration file, with additional documentation for clarity. This aligns the configuration with the actual capabilities of the PostgreSQL Docker container being used.

Fixes #419.

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Samples Checklist

✅ All good!