Switch binary source to get new features

Switch the source of oauth2-proxy binary to https://github.com/oauth2-proxy/oauth2-proxy, the current one has been archived and is no longer updated. Plus, the current binary no longer works for Github because a feature it uses has been deprecated.

0.1.2

Add desc. to meta/main.yml

0.1.1

Add desc. to meta/main.yml

0.1.0

Intial commit