Kyverno ephemeral containers

General MR

Summary

Adding block-ephemeral-containers policy and test

Relevant logs/screenshots

Link to BB MR: big-bang/bigbang!5420

Pods created in test manifests have limited permissions and cannot execute kubectl commands therefore a separate test script was created: test-ephemeral.sh

Test Script shows the policy sucessfully denies execution of kubectl debug command:

Linked Issue

issue

Upgrade Notices

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