Add VM creation failure test for unsigned vendor image

Bug: 285855436
Test: atest MicrodroidTests#creationFailsWithUnsignedVendorPartition

Change-Id: I1a8ec9d08a12a05fabb67a776e47eeeb24cf23be
diff --git a/tests/testapk/AndroidTest.xml b/tests/testapk/AndroidTest.xml
index e72a2e3..8a4c367 100644
--- a/tests/testapk/AndroidTest.xml
+++ b/tests/testapk/AndroidTest.xml
@@ -30,6 +30,7 @@
     <target_preparer class="com.android.compatibility.common.tradefed.targetprep.FilePusher">
         <option name="cleanup" value="true" />
         <option name="push" value="test_microdroid_vendor_image.img->/data/local/tmp/cts/microdroid/test_microdroid_vendor_image.img" />
+        <option name="push" value="test_microdroid_vendor_image_unsigned.img->/data/local/tmp/cts/microdroid/test_microdroid_vendor_image_unsigned.img" />
     </target_preparer>
     <test class="com.android.tradefed.testtype.AndroidJUnitTest" >
         <option name="package" value="com.android.microdroid.test" />