metropolis/test/e2e: add self-test image for networking

We don't have any networking tests in our E2E tests. This adds an image
which de-facto implements one. Or at least, will implement one once we
move to split workers/controllers and contacting a Kubernetes apiserver
from a pod will mean we're actually testing cross-node traffic.

Change-Id: I3d7be3824ac041d72e1c19cd468d30dbcb71fa03
Reviewed-on: https://review.monogon.dev/c/monogon/+/1481
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/node/BUILD.bazel b/metropolis/node/BUILD.bazel
index b03b107..942a9ab 100644
--- a/metropolis/node/BUILD.bazel
+++ b/metropolis/node/BUILD.bazel
@@ -76,6 +76,7 @@
 
         # Containerd preseed bundles
         "//metropolis/test/e2e/preseedtest:preseedtest_image.tar": "/containerd/preseed/k8s.io/preseedtest.tar",
+        "//metropolis/test/e2e/selftest:selftest_image.tar": "/containerd/preseed/k8s.io/selftest.tar",
         "//metropolis/vm/smoketest:smoketest_container.tar": "/containerd/preseed/k8s.io/smoketest.tar",
 
         # CNI Plugins