fix: security-secretstore-setup volume init semantics

fixes: edgexfoundry#3852
Signed-off-by: Valina Li <valina.li@intel.com>

cmd/security-secretstore-setup/entrypoint.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/dumb-init /bin/sh
 #  ----------------------------------------------------------------------------------
-#  Copyright (c) 2020 Intel Corporation
+#  Copyright (c) 2022 Intel Corporation
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -21,6 +21,9 @@ set -e
 
 # env settings are populated from env files of docker-compose
 
+# make config vault asset directory for case of helm
+mkdir -p /vault/config/assets
+
 echo "Initializing secret store..."
 /security-secretstore-setup --vaultInterval=10