fix(installer): make apt installs noninteractive

test/scripts/install-sh.test.ts

@@ -0,0 +1,31 @@
+import { readFileSync } from "node:fs";
+import { describe, expect, it } from "vitest";
+
+const SCRIPT_PATH = "scripts/install.sh";
+
+describe("install.sh apt behavior", () => {
+  const script = readFileSync(SCRIPT_PATH, "utf8");
+
+  it("runs apt-get through noninteractive wrappers", () => {
+    expect(script).toContain("apt_get()");
+    expect(script).toContain('DEBIAN_FRONTEND="${DEBIAN_FRONTEND:-noninteractive}"');
+    expect(script).toContain('NEEDRESTART_MODE="${NEEDRESTART_MODE:-a}"');
+    expect(script).toContain("sudo env DEBIAN_FRONTEND=");
+    expect(script).toContain("-o Dpkg::Options::=--force-confdef");
+    expect(script).toContain("-o Dpkg::Options::=--force-confold");
+
+    const rawAptInstalls = script
+      .split("\n")
+      .filter((line) => /\b(?:sudo\s+)?apt-get\s+install\b/.test(line));
+    expect(rawAptInstalls).toEqual([]);
+  });
+
+  it("exports noninteractive apt env during Linux startup", () => {
+    expect(script).toMatch(
+      /detect_os_or_die\s+if \[\[ "\$OS" == "linux" \]\]; then\s+export DEBIAN_FRONTEND="\$\{DEBIAN_FRONTEND:-noninteractive\}"\s+export NEEDRESTART_MODE="\$\{NEEDRESTART_MODE:-a\}"\s+fi/m,
+    );
+    expect(script).toContain(
+      'run_quiet_step "Configuring NodeSource repository" sudo -E bash "$tmp"',
+    );
+  });
+});