Fix workflow:

1. add sudo to commmands.
2. explicitly set LC_ALl to zh_CN.UTF-8. I am not sure whether the env:
setting in a step can be passed down.

.github/workflows/deploy_bookdown.yml

@@ -27,16 +27,15 @@ jobs:
         run: sudo apt-get install -y fonts-noto-cjk
       - name: setup locale
         run: |
-          apt-get install -y locales
-          sed -i -e 's/# zh_CN.UTF-8 UTF-8/zh_CN.UTF-8 UTF-8/' /etc/locale.gen && locale-gen
+          sudo apt-get install -y locales
+          sudo sed -i -e 's/# zh_CN.UTF-8 UTF-8/zh_CN.UTF-8 UTF-8/' /etc/locale.gen
+          sudo locale-gen
         shell: bash
-        env:
-          LC_ALL: zh_CN.UTF-8
       - uses: foxsen/actions/setup-tinytex-new@tinytex-v2
         with:
           cache-version: 6
       - name: Render Book
-        run: export PATH=$PATH:$HOME/bin; make -j8
+        run: export PATH=$PATH:$HOME/bin; export LC_ALL=zh_CN.UTF-8; make -j8
         shell: bash
       - uses: actions/upload-artifact@v1
         with: