authelia: Add OIDC client for step-ca

*step-ca* uses OpenID Connect to authenticate requests for SSH and X.509
certificates.

authelia/configuration.yml

@@ -59,6 +59,12 @@ identity_providers:
         $pbkdf2-sha512$310000$TkQ1BwLrr.d8AVGWk2rLhA$z4euAPhkkZdjcxKFD3tZRtNQ/R78beW7epJ.BGFWSwQdAme5TugNj9Ba.aL5TEqrBDmXRW0xiI9EbxSszckG5A
       redirect_uris:
       - https://burp.pyrocufflink.blue:9090/oauth_callback
+    - id: step-ca
+      description: step-ca
+      public: true
+      redirect_uris:
+      - http://127.0.0.1
+      pre_configured_consent_duration: 7d
 
 log:
   level: trace