fix: preserve Next.js deploy cache

src/lib/deploy-workflow-contract.test.ts

@@ -0,0 +1,12 @@
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
+import { describe, expect, it } from "vitest";
+
+describe("production deploy workflow", () => {
+  const workflow = readFileSync(resolve(process.cwd(), ".gitea/workflows/deploy.yaml"), "utf8");
+
+  it("preserves the Next.js incremental build cache", () => {
+    expect(workflow).not.toMatch(/rm\s+-rf[^\n]*\.next/);
+    expect(workflow).toContain("pnpm install --frozen-lockfile");
+  });
+});