improvement(ci): timeouts, docs-only PR skip, fork-isolated caches, N… #22421

Job	Run time
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	5m 19s
Detect Version	4s
Build AMD64 (./docker/pii.Dockerfile, ghcr.io/simstudioai/pii, ECR_PII)	2m 48s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	1m 8s
Test and Build / Lint and Test	3m 15s
Test and Build / Build App	3m 5s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	26s
Migrate Dev DB	0s
Build ARM64 (GHCR Only)	0s
Deploy Trigger.dev (Dev)	0s
Check Docs Changes	-7s
Build Dev ECR	0s
Migrate DB / Apply Database Migrations	41s
Promote Images	15s
Process Docs	0s
Create GHCR Manifests	0s
Create GitHub Release	0s
	16m 54s

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