feat: #8460, export groups members as csv

public/openapi/read.yaml

@@ -2276,6 +2276,26 @@ paths:
               schema:
                 type: string
                 format: binary
+  /api/admin/groups/{groupname}/csv:
+    get:
+      tags:
+        - admin
+      summary: Get members of a group (.csv)
+      parameters:
+        - in: header
+          name: referer
+          schema:
+            type: string
+          required: true
+          example: /admin/manage/groups
+      responses:
+        "200":
+          description: "A CSV file containing all users in the group"
+          content:
+            text/csv:
+              schema:
+                type: string
+                format: binary
   /api/admin/analytics:
     get:
       tags: