* added OpenID Connect as an SSO option
* minor fixes
* added comments, removed an option that shouldn't be set
* fixed Gemfile.lock
* added newline to end of Gemfile.lock
* removed tab from Gemfile.lock
* remove chomp
* codeclimate changes and small name change to make function's purpose clearer
* codeclimate fix
* added SSO buttons to /about page
* minor refactor
* minor style change
* removed spurious change
* removed unecessary conditional from ensure_valid_username and added support for auth.info.name in user_params_from_auth
* minor changes
Fixes#15959
Introduced in #6540, OAUTH_REDIRECT_AT_SIGN_IN allowed skipping the log-in form
to instead redirect to the external OmniAuth login provider.
However, it did not prevent the log-in form on /about introduced by #10232 from
appearing, and completely broke with the introduction of #15228.
As I restoring that previous log-in flow without introducing a security
vulnerability may require extensive care and knowledge of how OmniAuth works,
this commit removes support for OAUTH_REDIRECT_AT_SIGN_IN instead for the time
being.
When using a CAS server, the users only have a temporary email
`change@me-foo-cas.com` which can't be changed but by an
administrator.
We need a new environment variable like for SAML to assume the email
from CAS is verified.
* config/initializers/omniauth.rb: define CAS option for assuming
email are always verified.
* .env.nanobox: add new variable as an example.
