Moved the NodeJS version of the application to the app/ directory.

app/backend/test/version.test.ts

@@ -0,0 +1,14 @@
+import { describe, expect, it } from "vitest";
+import { sortImageVersionsIfSemantic } from "../src/version";
+
+describe("sortImageVersionsIfSemantic", () => {
+  it("sorts only semantic versions", () => {
+    const sorted = sortImageVersionsIfSemantic(["1.10.0", "1.2.0", "2.0.0"]);
+    expect(sorted).toEqual(["1.2.0", "1.10.0", "2.0.0"]);
+  });
+
+  it("sorts non-semantic versions naturally", () => {
+    const original = ["latest", "1.0.0", "beta"];
+    expect(sortImageVersionsIfSemantic(original)).toEqual(["1.0.0", "beta", "latest"]);
+  });
+});