make build/shell.sh pass shellcheck

build/shell.sh

@@ -22,7 +22,7 @@ set -o errexit
 set -o nounset
 set -o pipefail
 
-KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
+KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
 source "${KUBE_ROOT}/build/common.sh"
 
 KUBE_RUN_COPY_OUTPUT="${KUBE_RUN_COPY_OUTPUT:-n}" "${KUBE_ROOT}/build/run.sh" bash "$@"

hack/.shellcheck_failures

@@ -8,7 +8,6 @@
 ./build/release-in-a-container.sh
 ./build/release.sh
 ./build/run.sh
-./build/shell.sh
 ./build/util.sh
 ./cluster/addons/addon-manager/kube-addons.sh
 ./cluster/addons/fluentd-elasticsearch/es-image/run.sh