Automatic merge from submit-queue (batch tested with PRs 63453, 64592, 64482, 64618, 64661). 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>.

Add Makefile target to push fat manifest for multi-arch images
Signed-off-by: Nitesh Konkar <niteshkonkar@in.ibm.com>



**What this PR does / why we need it**:
This PR adds support to push fat manifest for multi-arch images. We need this
so that we can seamlessly pull and run the test images on multiple platforms. 

**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

```