refactor: finalize type-safe env and config using @mintel/next-utils 1.7.8

lib/env.ts

@@ -10,9 +10,7 @@ import { validateMintelEnv, mintelEnvSchema } from '@mintel/next-utils';
  * - Logging
  * - Analytics
  */
-export const envSchema = z.object({
-  ...mintelEnvSchema,
-
+const envExtension = {
   // Project specific overrides or additions
   AUTH_COOKIE_NAME: z.string().default('klz_gatekeeper_session'),
 
@@ -29,12 +27,12 @@ export const envSchema = z.object({
 
   INFRA_DIRECTUS_URL: z.string().url().optional(),
   INFRA_DIRECTUS_TOKEN: z.string().optional(),
-});
+};
 
 /**
  * Validated environment object.
  */
-export const env = validateMintelEnv(envSchema.shape);
+export const env = validateMintelEnv(envExtension);
 
 /**
  * For legacy compatibility with existing code.