feat: improve release error reporting and test coverage (#813)

Signed-off-by: Rui Chen <rui@chenrui.dev>

__tests__/main.test.ts

@@ -0,0 +1,11 @@
+import { expect, it, vi } from 'vitest';
+
+const run = vi.hoisted(() => vi.fn().mockResolvedValue(undefined));
+
+vi.mock('../src/run', () => ({ run }));
+
+it('starts the action orchestration', async () => {
+  await import('../src/main');
+
+  expect(run).toHaveBeenCalledOnce();
+});