Update gh-pages.yml

fix: BASE_URL and SITE_URL

.github/workflows/gh-pages.yml

@@ -36,6 +36,9 @@
           - name: Install dependencies
             run: npm ci
           - name: Build
+            env:
+              BASE_URL: ${{ vars.BASE_URL }}
+              SITE_URL: ${{ vars.SITE_URL }}
             run: npm run build
           - name: Upload artifact
             uses: actions/upload-pages-artifact@v3