Specify empty environments for vkcube

vkcube tests run forever, so they should only ever be run manually.

Change-Id: Idc81339fc64488ac19f00404dfe6479c2b79b28f
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/Vulkan-Tools/+/863901
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
Fuchsia-Auto-Submit: John Bauman <jbauman@google.com>
Reviewed-by: Craig Stout <cstout@google.com>
diff --git a/cube/BUILD.gn b/cube/BUILD.gn
index 485ea71..45a5e2d 100644
--- a/cube/BUILD.gn
+++ b/cube/BUILD.gn
@@ -38,6 +38,10 @@
 
 fuchsia_test_package("vkcube-on-fb") {
   test_components = [ ":vkcube-on-fb-component" ]
+  test_specs = {
+    # vkcube runs forever, so only run manually.
+    environments = []
+  }
 }
 
 fuchsia_test_component("vkcube-on-fb-protected-component") {
@@ -52,6 +56,10 @@
 
 fuchsia_test_package("vkcube-on-fb-protected") {
   test_components = [ ":vkcube-on-fb-protected-component" ]
+  test_specs = {
+    # vkcube runs forever, so only run manually.
+    environments = []
+  }
 }
 
 fuchsia_component("vkcube-on-scenic-component") {
@@ -95,6 +103,10 @@
 
 fuchsia_test_package("vkcube-skip-present") {
   test_components = [ ":vkcube-skip-present-component" ]
+  test_specs = {
+    # vkcube runs forever, so only run manually.
+    environments = []
+  }
 }
 
 config("cube_config") {