add compare targets to diff images from previous release; update readme #203
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Adds a couple
compare
targets so users (and CI) can generate a list of images that have changed since a previous release. It works like this:The releases default to latest k8s release compared to latest stable cdk-addons release, but can be overridden with
KUBE_VERSION
andPREV_RELEASE
variables.Partial fix for https://bugs.launchpad.net/cdk-addons/+bug/1891530; the rest will come from the jenkins job that uses this target to help the doc team highlight image changes in our release notes.