Resolve "cm-push plugin installation fails with Helm 4"

        helm ${TRACE+--debug} push "$_pkg" "$HELM_PUBLISH_URL"

      else

        log_info "Installing cm-push plugin (version ${HELM_CM_PUSH_PLUGIN_VERSION:-latest})..."

        cm_push_plugin_verify_flag=""

        plugin_helm_major="$(helm version --short 2>/dev/null | sed 's/^v//' | cut -d. -f1)"

        # Helm version support EOL : https://helm.sh/el/blog/helm-4-released/#helm-v3-support

        if echo "$plugin_helm_major" | awk '/^[0-9]+$/ {exit 0} {exit 1}' && [ "$plugin_helm_major" -ge 4 ]; then

          cm_push_plugin_verify_flag="--verify=false" # Disable signature verification because cm-push is not signed (https://github.com/chartmuseum/helm-push/issues/243)

          log_info "--- helm v${plugin_helm_major} detected: plugin signature verification = \e[33;1mfalse\e[0m (--verify flag used)"

        else

          log_info "--- helm v${plugin_helm_major} detected: signature verification not supported (--verify flag ignored)"

        fi

        # shellcheck disable=SC2086

        helm ${TRACE+--debug} plugin install ${HELM_CM_PUSH_PLUGIN_VERSION:+--version "$HELM_CM_PUSH_PLUGIN_VERSION"} https://github.com/chartmuseum/helm-push || true

        helm ${TRACE+--debug} plugin install ${cm_push_plugin_verify_flag} ${HELM_CM_PUSH_PLUGIN_VERSION:+--version "$HELM_CM_PUSH_PLUGIN_VERSION"} https://github.com/chartmuseum/helm-push || true

        # shellcheck disable=SC2086

        helm ${TRACE+--debug} cm-push --username "$username" --password "$password" "$_pkg" "$HELM_PUBLISH_URL"

      fi