Dockerfile: add OpenSSL to Docker container
Dockerfile: add OpenSSL to Docker container

Add OpenSSL to the dex Docker container so wget can be used to query
HTTPS endpoint. This is a requirement for health checking when dex is
doing its own TLS termination.

This increased the image size from 20.37 MB to 20.92 MB (+550 KB).

Additionally add Ed and Rithu as maintainers.

rithujohn191/dex,rithujohn191/dex,circleci/dex,ericchiang/dex,Calpicow/dex,holgerkoser/dex,coreos/dex,xeonx/dex,xeonx/dex,wolfeidau/dex,holgerkoser/dex,xeonx/dex,jwmaag/dex,chub/coreos-dex,holgerkoser/dex,ericchiang/dex,coreos/dex,coreos/dex,Calpicow/dex,jwmaag/dex,jwmaag/dex,rithujohn191/dex,circleci/dex,wolfeidau/dex,ericchiang/dex,wolfeidau/dex,chub/coreos-dex,Calpicow/dex,chub/coreos-dex,circleci/dex