improvement(nested): subagents #17919

Job	Run time
Detect Version	4s
Check Docs Changes	0s
Test and Build	0s
Build Dev ECR (./docker/realtime.Dockerfile, ECR_REALTIME)	29s
Build Dev ECR (./docker/db.Dockerfile, ECR_MIGRATIONS)	25s
Build Dev ECR (./docker/app.Dockerfile, ECR_APP)	3m 18s
Build ARM64 (GHCR Only)	-1s
Build AMD64	-1s
Create GHCR Manifests	-1s
Process Docs	-1s
Create GitHub Release	0s
Migrate Dev DB / Apply Database Migrations	45s
	4m 57s

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