base-lite/ub/ub.go is not the latest source code

[aborrero]

Hello,

we have detected that the source code of base-lite/ub/ub.go is not the latest.

In https://github.com/confluentinc/kafka-images/pull/403/files#diff-50266ac00cfedb6b06dd955cedffd417603555c2e9da4241147c600c51d8387e there are new template functions mentioned, liike stringSlice and envToProps that can't be found in the ub.go source code.

However, the docker image contains a binary that does indeed have the functions:

#  /tmp
➜ docker run --rm --entrypoint cat confluentinc/cp-kafka:latest /usr/bin/ub > official-ub
#  /tmp
➜ echo '{{- $test := stringSlice "works" -}}{{$test}}' > test.tmpl
#  /tmp
➜ chmod +x official-ub
#  /tmp
➜ ./official-ub render-template test.tmpl
[works]
#  /tmp

We are having a hard time running the latest confluent-kafka images without access to the latest ub.go source code. Please publish it.

[aborrero]

I just found this https://github.com/confluentinc/cp-docker-utils/blob/master/cmd/ub/ub.go