Add oCIS cloud storage with Authelia OIDC

Deploy ownCloud Infinite Scale as a self-hosted cloud storage service
at cloud.kolpacksoftware.com using Authelia as the external OIDC IdP.
Configures a PKCE public client (no secret required).

authelia/config/configuration.yaml

@@ -107,3 +107,22 @@ identity_providers:
           - email
           - groups
         userinfo_signed_response_alg: none
+
+      - client_id: ocis
+        client_name: ownCloud Infinite Scale
+        public: true
+        require_pkce: true
+        pkce_challenge_method: S256
+        authorization_policy: one_factor
+        redirect_uris:
+          - https://cloud.kolpacksoftware.com/
+          - https://cloud.kolpacksoftware.com/oidc-callback.html
+          - https://cloud.kolpacksoftware.com/oidc-silent-redirect.html
+          - https://cloud.kolpacksoftware.com/apps/openidconnect/redirect
+        scopes:
+          - openid
+          - profile
+          - email
+          - groups
+          - offline_access
+        userinfo_signed_response_alg: none