Check docker before build

extra/test-docker.js

@@ -0,0 +1,9 @@
+// Check if docker is running
+const { exec } = require("child_process");
+
+exec("docker ps", (err, stdout, stderr) => {
+    if (err) {
+        console.error("Docker is not running. Please start docker and try again.");
+        process.exit(1);
+    }
+});