fix: oidc scopes are invalid when concatenated (#3332)

doc/config/environment-variables.md

@@ -105,7 +105,7 @@ This document contains all the environment variables which are available for thi
 | `OIDC_ISSUER` | String | The OIDC issuer URL |  |
 | `OIDC_IDENTIFIER` | String | The client ID for OIDC |  |
 | `OIDC_SECRET` | String | The client secret for OIDC |  |
-| `OIDC_SCOPES` | Array of strings | Scopes to request from the OIDC server. | openid,email |
+| `OIDC_SCOPES` | Array of strings | Scopes to request from the OIDC server. | ["openid", "email"] |
 | `OIDC_UID_FIELD` | String | The field to use to determine the user's UID | sub |
 | `OIDC_EMAIL_ADDRESS_FIELD` | String | The field to use to determine the user's email address | email |
 | `OIDC_NAME_FIELD` | String | The field to use to determine the user's name | name |

doc/config/yaml.yml

@@ -239,7 +239,8 @@ oidc:
   secret: 
   # Scopes to request from the OIDC server.
   scopes:
-    - openid,email
+    - openid
+    - email
   # The field to use to determine the user's UID
   uid_field: sub
   # The field to use to determine the user's email address

lib/postal/config_schema.rb

@@ -550,7 +550,7 @@ module Postal
       string :scopes do
         description "Scopes to request from the OIDC server."
         array
-        default "openid,email"
+        default ["openid", "email"]
       end
 
       string :uid_field do