Docker.io ratelimit workaround

Also had to fix cover test.

Change-Id: Ic09c783b23c0c8e9da9f5f984e2d2aaec5320fd4

images/armada/Dockerfile.ubuntu_jammy

@@ -1,4 +1,10 @@
-ARG FROM=ubuntu:jammy
+#
+# In order to fix rate limit error
+#
+# 429 Too Many Requests - Server message: too many requests:
+#   You have reached your pull rate limit.
+#   You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit
+ARG FROM=public.ecr.aws/ubuntu/ubuntu:jammy
 ARG ARMADA_GO=quay.io/airshipit/armada-go:latest-ubuntu_focal
 FROM ${ARMADA_GO} AS armada_go
 FROM ${FROM}