env: fix unexpected character bug with recent docker desktop

This prevents the following parsing errors in recent Docker Desktop app:

- unexpected character "!" in variable name near "to Web Chat!\\n\\n...
- respectively: unexpected character "-" in variable name near "super-light-editor light-background full-width-editor...

Co-authored-by: Werner Fleischer <70745309+wernf@users.noreply.github.com>