feat(byok-migration) byok migration script (#3584) #11618

Job	Run time
Detect Version	3s
Test and Build / Test and Build	39s
Check Docs Changes	-1s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	5m 38s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	3m 3s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	1m 10s
Build ARM64 (GHCR Only)	0s
Create GHCR Manifests	0s
Process Docs	0s
Create GitHub Release	0s
	10m 32s

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