help/bug: The way to read full config (CONFIG_DB)

[avl-dev]

Tried to read full config after #143 and #145 pull requests.

How to reproduce:
Build new image-vs with this repo https://github.com/sonic-net/sonic-buildimage (took 202305 branch version) and patch with #143 and #145 commits. Added it to GNS3 and started testing.

the command that was run (after deploy):
gnmi_get -target_name "$(hostname)" -ca dsmsroot.cer -cert streamingtelemetryserver.cer -key streamingtelemetryserver.key -target_addr 127.0.0.1:50051 -xpath "/sonic-db:CONFIG_DB/"

issue that was occurred:

[gnmi_get.go:142] Get failed: rpc error: code = Unavailable desc = transport is closing

Am I doing this correctly or there is another way to read full config (CONFIG_DB table)?