Improve database connection configuration and documentation for SSL

Update `docker-compose.yml` and `server/db.ts` to allow dynamic configuration of PostgreSQL SSL connections via the `DATABASE_SSL` environment variable. Add `DOCKER-DATABASE-SSL-GUIDE.md` detailing SSL options and troubleshooting.

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server/db.ts

@@ -15,11 +15,21 @@ export function getDatabase() {
       throw new Error('DATABASE_URL environment variable is not set');
     }
 
+    // Configure SSL based on DATABASE_SSL environment variable
+    // Values: 'true', 'false', or 'require'
+    // Default: false (no SSL)
+    let sslConfig: any = false;
+    
+    if (process.env.DATABASE_SSL === 'true') {
+      sslConfig = { rejectUnauthorized: false };  // SSL with self-signed certs
+    } else if (process.env.DATABASE_SSL === 'require') {
+      sslConfig = { rejectUnauthorized: true };   // SSL with valid certs only
+    }
+    // Otherwise defaults to false (no SSL)
+
     pool = new Pool({
       connectionString: databaseUrl,
-      ssl: process.env.NODE_ENV === 'production' 
-        ? { rejectUnauthorized: false }  // Allow self-signed certificates in production
-        : false,  // No SSL in development
+      ssl: sslConfig,
     });
 
     db = drizzle(pool, { schema });