chore(action): add env for deploying gh page correctly

Author: mattwang44

.github/workflows/cd.yml

@@ -34,6 +34,10 @@ jobs:
 
             -   name: Build 👷🏽
                 run: npm run generate
+                env:
+                    ROUTER_BASE: /pycontw-2021/  # repo name
+                    BUILD_TARGET: static
+                    API_URL_BROWSER: https://staging.pycon.tw/prs
 
             -   name: Deploy 🚀
                 uses: JamesIves/[email protected]