Makefile: add target to build openmina-node-testing

Author: dannywillems

Makefile

@@ -18,6 +18,10 @@ build-ledger: download-circuits ## Build the ledger binary and library, requires
 build-release: ## Build the project in release mode
 	cargo build --release --package=cli --bin openmina
 
+.PHONY: build-testing
+build-testing: ## Build the testing binary with scenario generators
+	cargo build --release --features scenario-generators --bin openmina-node-testing
+
 .PHONY: build-tests-webrtc
 build-tests-webrtc: ## Build tests for WebRTC
 	@mkdir -p target/release/tests