environment variables cannot use a dash in its name

[jakguel]

Hello Guys

i encountered following problem
My Plugin has a dash in its name, e.g. "my-plugin"
So when i try to set an variable like this in my env:
APPCONF_my-plugin_myvar=1

This will not work in bash/sh or whatever shell. It works in Docker Compose and Kubernetes if you set the env variable there, but thats because docker passes the env variables in a different way.
In my case i needed to run a shell script because of an dependent arithmetic expression as value:
eval export APPCONF_my-plugin_myvar=$(( BLAH + X )) which will result in an error like this :sh: export: APPCONF_my-plugin_myvar: bad variable name

The reason is: dashes are not supported in environment variabel names.
My solution was to echo the output of my expression into a new toml file, and include it into the original config toml

But what would be easier is if wild-config could just replace something like a double underscore "__" into a dash OR if wild-config would just ignore dashes in plugin names if there is not any collision with another plugin