experimental VM test: add -v

Apparently if you don't add -v the tests don't report anything useful when they break. Joy.

Signed-Off-By: Christine Dodrill <xe@tailscale.com>

.github/workflows/xe-experimental-vm-test.yml

@@ -26,7 +26,7 @@ jobs:
           XDG_CACHE_HOME: "/var/lib/ghrunner/cache"
 
       - name: Run VM tests
-        run: go test ./tstest/integration/vms -run-vm-tests
+        run: go test ./tstest/integration/vms -v -run-vm-tests
         env:
           TMPDIR: "/tmp"
           XDG_CACHE_HOME: "/var/lib/ghrunner/cache"