Add a Kustomize plugin to OpenShift GitOps in RHOCP4

Issue

• Openshift GitOps apps reporting an error unable to find plugin root.

ComparisonError: rpc error: code = Unknown desc = `kustomize build /test/appconfig --enable-alpha-plugins` failed exit status 1: Error: loading generator plugins: unable to find plugin root - tried: ('<no value>'; homed in $KUSTOMIZE_PLUGIN_HOME), ('<no value>'; homed in $XDG_CONFIG_HOME), ('/.config/kustomize/plugin'; homed in default value of $XDG_CONFIG_HOME), ('/kustomize/plugin'; homed in home directory)

• Unable to add Kustomize plugins in Openshift GitOps.