Add vulkan unit tests to Kokoro

Change-Id: I6e695dd5221da6d9f7f198bc2af8aee00eda8881
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/26808
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

kokoro/gcp_ubuntu/continuous.sh

diff --git a/kokoro/gcp_ubuntu/continuous.sh b/kokoro/gcp_ubuntu/continuous.sh
index 7b965f9..6bee5f4 100755
--- a/kokoro/gcp_ubuntu/continuous.sh
+++ b/kokoro/gcp_ubuntu/continuous.sh
@@ -14,7 +14,12 @@
 cmake ..
 make --jobs=$(nproc)
 
+# Run the reactor unit tests.
+./ReactorUnitTests
+
 # Run the GLES unit tests. TODO(capn): rename.
 ./unittests
 
-./ReactorUnitTests
\ No newline at end of file
+# Run the Vulkan unit tests.
+cd .. # Must be run from project root
+build/vk-unittests