Adding rmq

[adnazujolakisic]

• RabbitMQ messaging — Wired the shop to a dedicated order-notifications queue: order-service publishes after successful checkout; payload includes order metadata and optional baggage on message headers for mirrord filtering.
• New notifications-service — Small Node service that subscribes to that queue, logs/handling as implemented
• Order service — Direct checkout path publishes to Rabbit;
• Kubernetes — Deployments/env for Rabbit URL + queue name on order-service and notifications-service; shop kustomization includes the new app; optional mirrord operator CRs for RMQ cluster + workload queue registry tied to that deployment.
• mirrord config — Added/updated mirrord.json (and repo .mirrord/*.json) for notifications-service: operator target, split_queues for order-notifications (RMQ + message_filter on baggage)
• CI / image — Workflow to build and push the notifications-service image to GHCR so clusters can pull it.

[aris-cub]

LGTM. Can we merge this over the weekend as this is a big change?

[adnazujolakisic]

@aris-cub no worries i am still working on it

[aris-cub]

You can merge after your last demo tomorrow. As it will be mine and @danielbaker weekend already.

[adnazujolakisic]

@aris-cub i didn't finish visualization but this should be working. Let me know if i could merge this tomorrow, i dont have demos half of the day which will give me some time to fix if something fails though there are no a lot of changes to the xisting files.

[aris-cub]

@adnazujolakisic Sure we are off today and tomorrow so no demos for me