Fix multi images e2e test.

[dkarpele]

1. Use public images nginx and memcached to test update for the pod with 2 containers.

We can't use local docker registry for images named <ip>:<port>/<image_name>:<tag> because ArgoCD evaluates all images that starts with <ip>:<port> as the same images regardless <image_name>.

The function in ArgoCD that works wrong in this case is:

// Match returns true if the image name matches (i.e. up to the first delimiter)
func (i KustomizeImage) Match(j KustomizeImage) bool {
	delim := j.delim()
	imageName, _, _ := strings.Cut(string(i), delim)
	otherImageName, _, _ := strings.Cut(string(j), delim)
	return imageName == otherImageName
}

The question whether to fix the problem above or not is still open.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.49%. Comparing base (7e4c52a) to head (a57794d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1066   +/-   ##
=======================================
  Coverage   63.49%   63.49%           
=======================================
  Files          15       15           
  Lines        2326     2326           
=======================================
  Hits         1477     1477           
  Misses        758      758           
  Partials       91       91           

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[chengfang]

can we configure the internal registry as the default for this test, and omit the url in deployment.yaml?