feat: add production build and health tooling

chfs-ng/internal/api/root_handler_test.go

@@ -33,3 +33,23 @@ func TestRootEscapesPlainNotice(t *testing.T) {
 		t.Fatal("plain notice was not escaped")
 	}
 }
+
+func TestHealthz(t *testing.T) {
+	s := &Server{}
+	old := Version
+	Version = "test"
+	defer func() { Version = old }()
+
+	rr := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodGet, "/healthz", nil)
+	s.Handler().ServeHTTP(rr, req)
+	if rr.Code != http.StatusOK {
+		t.Fatalf("status=%d body=%s", rr.Code, rr.Body.String())
+	}
+	if got := rr.Header().Get("Cache-Control"); got != "no-store" {
+		t.Fatalf("cache-control=%q", got)
+	}
+	if !strings.Contains(rr.Body.String(), `"status":"ok"`) || !strings.Contains(rr.Body.String(), `"version":"test"`) {
+		t.Fatalf("unexpected body=%s", rr.Body.String())
+	}
+}