Is this a BUG REPORT or FEATURE REQUEST?:

/kind feature

Problem:
Kubernetes does not support : in environment variables. I can see that the subject has recently been discussed in PR #48986. .NET Core uses : to replace config variables as mentioned in this comment. The limitation in kubernetes requires me to perform some ugly hacks to override the config values.

Proposed Solution:
I'm in favor of the sentiment that kubernetes should not censor environment variables at all, but specifically I would like : to be allowed.