chore(guide): update contributing guide (#4296) #15268

Job	Run time
Detect Version	4s
Check Docs Changes	0s
Test and Build	0s
Build Dev ECR (./docker/db.Dockerfile, ECR_MIGRATIONS)	1m 26s
Build Dev ECR (./docker/app.Dockerfile, ECR_APP)	1m 25s
Build Dev ECR (./docker/realtime.Dockerfile, ECR_REALTIME)	1m 28s
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	31s
	4m 50s

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