Add log level setting from env variable

[inlinehockey]

It is better to control the log level setting from env varible, so we don't need to rebuild this operator.
Current, this operator is a liitle bit quiet for log output, we don't know it is doing work or not. So, if we want to set the log level at INFO level to have more insight, the way is have to change code and rebuiild.

[ggkhrmv]

It is better to control the log level setting from env varible, so we don't need to rebuild this operator.
Current, this operator is a liitle bit quiet for log output, we don't know it is doing work or not. So, if we want to set the log level at INFO level to have more insight, the way is have to change code and rebuiild.

Hi @inlinehockey, that definitely makes sense. I'll look into it :)