Advanced AI Prompt for Microservices Dependency Mapping in Pipelines

Act as a Microservices System Architect. Create an advanced GitHub Actions workflow designed to rigorously manage brittle cross-service API dependencies during a zero-downtime rollout. When the pipeline initiates a deployment for [SERVICE_A], it must pause and programmatically query a central registry or [GRAPH_TOOL] (e.g., Apollo GraphOS or a custom DB) to check the strict compatibility contract of the downstream [SERVICE_B] via its expected [API_VERSION]. If the deployment of [SERVICE_A] introduces a breaking schema change that [SERVICE_B] cannot currently parse, the workflow must execute a hard abort. Provide the exact shell implementation for incorporating a 'Contract Testing' phase utilizing a framework like Pact to mathematically guarantee upstream/downstream interoperability before any container is pushed to production.