Changed Makefile

* build-vm target is more reproducible
* boot-vm target now forward host port 8080 to vm port 80

Makefile

@@ -35,10 +35,13 @@ clean: ## Clean build artifacts and shutdown running virtual machines
 	exit 0
 
 build-vm: clean ## Build virtual machine for testing
-	nixos-rebuild build-vm -I nixos-config=./tests/test-config.nix
+	nixos-rebuild build-vm \
+		-I nixpkgs=http://nixos.org/channels/nixos-24.05/nixexprs.tar.xz \
+		-I nixos-config=./tests/test-config.nix
 
 boot-vm: ## Run virtual machine in current terminal
 	QEMU_KERNEL_PARAMS=console=ttyS0 \
+	QEMU_NET_OPTS=hostfwd=tcp::8080-:80 \
 	./result/bin/run-nixos-vm \
 		-nographic; \
 	reset