Merge pull request #67161 from dims/remove-local-manifest-list-after-push

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Remove the local manifest list after push

**What this PR does / why we need it**:

Manifests seem sticky in docker, so let's try to purge so if
we have re-push a fresh set of containers (with same version number as
before) during testing, the manifests are created fresh.

Change-Id: I41c010c08bd50b68ff6973a4ae1e004824fab178

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

test/images/image-util.sh

@@ -112,7 +112,7 @@ push() {
   for arch in ${archs}; do
     docker manifest annotate --arch ${arch} ${REGISTRY}/${IMAGE}:${TAG} ${REGISTRY}/${IMAGE}-${arch}:${TAG}
   done
-  docker manifest push ${REGISTRY}/${IMAGE}:${TAG}
+  docker manifest push --purge ${REGISTRY}/${IMAGE}:${TAG}
 }
 
 # This function is for building the go code