Add some more basic tests 🤷‍♂️

src/model/index.test.js

@@ -0,0 +1,10 @@
+import * as Index from '.';
+
+describe('Index', () => {
+  test.each(['Action', 'BuildParameters', 'Cache', 'Docker', 'Input', 'ImageTag', 'Platform'])(
+    'exports %s',
+    exportedModule => {
+      expect(typeof Index[exportedModule]).toStrictEqual('function');
+    },
+  );
+});