feat(ENG-3247): add auth origin domain cookie on token creation (#4187)

* feat(ENG-3247): add auth origin domain cookie to multiple routers and update Nginx config

backend/src/server/routes/v2/organization-router.ts

@@ -10,6 +10,7 @@ import {
 import { ApiDocsTags, ORGANIZATIONS } from "@app/lib/api-docs";
 import { getConfig } from "@app/lib/config/env";
 import { readLimit, writeLimit } from "@app/server/config/rateLimiter";
+import { addAuthOriginDomainCookie } from "@app/server/lib/cookie";
 import { GenericResourceNameSchema } from "@app/server/lib/schemas";
 import { verifyAuth } from "@app/server/plugins/auth/verify-auth";
 import { ActorType, AuthMode } from "@app/services/auth/auth-type";
@@ -396,6 +397,8 @@ export const registerOrgRouter = async (server: FastifyZodProvider) => {
         secure: cfg.HTTPS_ENABLED
       });
 
+      addAuthOriginDomainCookie(res);
+
       return { organization, accessToken: tokens.accessToken };
     }
   });