Add header

Author: koki-develop

lib/cli/index.ts

@@ -35,7 +35,12 @@ program.command("build [workflows...]").action(async (args: string[]) => {
     fs.mkdirSync(githubWorkflowsPath, { recursive: true });
     fs.writeFileSync(
       path.join(githubWorkflowsPath, `${filenameWithoutExtension}.yml`),
-      workflowYml,
+      [
+        "# DO NOT EDIT THIS FILE",
+        "# This file is automatically generated by ghats (https://www.npmjs.com/package/ghats)",
+        `# Edit the workflow in .github/workflows/${filenameWithoutExtension}.ts instead.`,
+        workflowYml,
+      ].join("\n"),
     );
   }
 });