add random match-making logic

main-server/config/initializers/redis.rb

@@ -0,0 +1,7 @@
+# Redis configuration
+# Development/test: localhost:6379 (default)
+# Production: set REDIS_URL env variable, e.g. redis://redis.example.com:6379/0
+
+RedisConnection = ConnectionPool.new(size: 5, timeout: 5) do
+  Redis.new(url: ENV.fetch("REDIS_URL", "redis://localhost:6380/0"))
+end