refactor: use environment, not .env, in ci (#65736)

curriculum/turbo.json

@@ -13,6 +13,9 @@
     "test-content": {
       "passThroughEnv": ["VITEST_POOL_ID", "PUPPETEER_WS_ENDPOINT"],
       "env": ["FCC_*", "CURRICULUM_LOCALE", "SHOW_UPCOMING_CHANGES"]
+    },
+    "lint": {
+      "env": ["CURRICULUM_LOCALE"]
     }
   }
 }