Allow running container with zero arguments

[jorrite]

The underlying CLI project allows you to run it without any arguments, specifying all parameters via ENV variables. This container, however, does not.

Steps to reproduce is just running the container via docker cli, without providing any arguments.

It is coming from here:

awsenergylabeler-docker/awsenergylabeler/Dockerfile

Line 27 in 1d04fa7

CMD [ "--help" ]

We shouldn't provide the default CMD statement here as that breaks the intended behavior of running the underlying CLI solely with ENV variables.