feat(integrations): add Brex integration (#4983) #18797

Job	Run time
Detect Version	4s
Test and Build / Test and Build	6m 10s
Migrate Dev DB	0s
Check Docs Changes	0s
Build ARM64 (GHCR Only)	0s
Build Dev ECR	0s
Migrate DB / Apply Database Migrations	34s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	39s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	4m 34s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	1m 25s
Create GHCR Manifests	-1s
Process Docs	-1s
Create GitHub Release	-1s
	13m 23s

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