docs: add status update to deployment diagram

docs/deployment.plantuml

@@ -4,12 +4,12 @@ actor "Runboat UI\n(Browser)" as RunboatUI
 
 component Runboat
 interface "WebUI: /builds, /builds/{name}\nSSE: /build-events\nAPI: /docs, /api/v1/...\n(8000)" as API
-interface "/webhooks/github" as Webhook
+interface "Runboat Webhook\n/webhooks/github" as Webhook
 
 interface "HTTP\n(80)" as IngressHTTP
 actor "Builds UI\n(Browser)" as BuildsUI
 component Kubernetes {
-    collections "Builds\n(Deployment,\nPersistentVolumeClaim,\n...)" as Builds
+    collections "Builds\n(Deployment,\nPersistentVolumeClaim,\nJob,\n...)" as Builds
     interface "HTTP\n(8069)" as BuildsHTTP
     component Ingress
 }
@@ -18,11 +18,14 @@ interface "Kubernetes API\n(HTTPS)" as K8SAPI
 database Postgres
 
 component GitHub
+interface "GitHub API\nhttps://api.github.com" as GitHubAPI
 
-Webhook - Runboat
+Runboat -- Webhook
 API -- Runboat
 
-GitHub -> Webhook
+Webhook <-- GitHub : "Events:\npush,\npull_request"
+GitHubAPI -- GitHub
+Runboat --> GitHubAPI : "Status updates"
 
 RunboatUI <--> API