feat(roadmap): add new resource to backend roadmap (#4965)

src/data/roadmaps/backend/content/123-scalability/100-mitigation-strategies/104-circuit-breaker.md

@@ -9,3 +9,4 @@ The circuit breaker design pattern is useful for protecting a system from failur
 Visit the following resources to learn more:
 
 - [Circuit Breaker - AWS Well-Architected Framework](https://docs.aws.amazon.com/wellarchitected/latest/reliability-pillar/rel_mitigate_interaction_failure_graceful_degradation.html)
+- [Circuit Breaker - Complete Guide](https://mateus4k.github.io/posts/circuit-breakers/)