Firecracker's devtool shouldn't wait the user's response

Asking "Continue? (y/n)" doesn't work under CI environments.

Signed-off-by: Kazuyoshi Kato <[email protected]>

Author: kzys

Makefile

@@ -336,20 +336,20 @@ $(FIRECRACKER_DIR)/Cargo.toml:
 
 $(FIRECRACKER_BIN): $(FIRECRACKER_DIR)/Cargo.toml
 	$(FIRECRACKER_DIR)/tools/devtool -y build --release && \
-		$(FIRECRACKER_DIR)/tools/devtool strip
+		$(FIRECRACKER_DIR)/tools/devtool -y strip
 	cp $(FIRECRACKER_DIR)/build/cargo_target/$(FIRECRACKER_TARGET)/release/firecracker $@
 
 .PHONY: firecracker-clean
 firecracker-clean:
-	- $(FIRECRACKER_DIR)/tools/devtool distclean
+	- $(FIRECRACKER_DIR)/tools/devtool -y distclean
 	- rm $(FIRECRACKER_BIN)
 	- rm $(KERNEL_BIN)
 
 .PHONY: kernel
 kernel: $(KERNEL_BIN)
 
 $(KERNEL_BIN): $(KERNEL_CONFIG)
-	$(FIRECRACKER_DIR)/tools/devtool build_kernel --config $(KERNEL_CONFIG)
+	$(FIRECRACKER_DIR)/tools/devtool -y build_kernel --config $(KERNEL_CONFIG)
 
 .PHONY: install-kernel
 install-kernel: $(KERNEL_BIN)