Run a ingress-gce script

It is tricky to run a list of commands inside
config yamls. To do that it's better to run
a script. The script builds & pushes the e2e-test
image on multiarch.

Signed-off-by: Elina Akhmanova <elinka@google.com>

config/jobs/kubernetes/sig-network/ingress-gce-e2e.yaml

@@ -167,10 +167,10 @@ postsubmits:
         - --
         - --env=VERSION=$(PULL_BASE_REF)
         - --env=REGISTRY=gcr.io/k8s-ingress-image-push
-        - make
-        - all-push
-        - ALL_ARCH=amd64 arm64
-        - CONTAINER_BINARIES=e2e-test
+        - --env=ALL_ARCH="amd64 arm64"
+        - --env=ARCH=$(dpkg --print-architecture)
+        - --env=BINARY=e2e-test
+        - hack/run-make-cmd.sh
         # docker-in-docker needs privileged mode
         securityContext:
           privileged: true