[keyserver] Add keyserver/.env to ignore files
Summary:
- Adding to .gitignore since it should not be checked in and I want it to stop showing up when I run git status
- Adding to .dockerignore so it doesn't get copied into the container for security reasons
Depends on D4211
Test Plan: I created .env.swp and tmp.env test files and made sure they were excluded from the Docker image by loading a container with that image and exploring around
Reviewers: palys-swm, atul
Reviewed By: palys-swm
Subscribers: Adrian, yayabosh
Differential Revision: https://phabricator.ashoat.com/D4212