feat(db): add postgres setup and multi-tenant config

Makefile

@@ -0,0 +1,13 @@
+.PHONY: up down logs status
+
+up:
+	bash start-db.sh
+
+down:
+	bash stop-db.sh
+
+logs:
+	docker compose logs -f postgres
+
+status:
+	docker ps --filter name=caspos-postgres