Adding locale environment variables

[joe-braley]

Per the suggestion in this issue. We would like to add the environment present variables present in non-distroless images to our distroless images.

Let's be sure that the variables are present in the correct layer 😉 . Running docker image inspect <IMAGE> I believe that these variables should be present as expected.

See below:

[karianna]

I'll note that there might be folks who don't want a US UTF-8 as a default, but we can provide override guidance in those cases.