Create update_docs.yml (#380)

test auto update docs

.github/workflows/update_docs.yml

@@ -0,0 +1,37 @@
+
+name: CI
+
+on:
+- pull_request:
+    types:
+      - closed
+- workflow_dispatch
+
+jobs:
+  if_merged:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: s-weigand/setup-conda@v1
+      - run: conda config --append channels conda-forge
+      - run: python3 -m pip install -r requirements.txt
+      - run: conda install -y pandoc==2.17
+      - run: pip install sphinx-mathjax-offline
+
+      - run: |
+          git clone https://github.com/openmlsys/d2l-book.git
+          cd d2l-book
+          python3 -m pip install .
+      - run: sh build_html.sh
+      - run: cd ..
+      - run: git clone https://github.com/openmlsys/openmlsys.github.io.git
+      - run: cp -r openmlsys-zh/_build/html/*  openmlsys.github.io/docs/
+      - run: |
+          cd openmlsys.github.io
+          git add .
+          git commit -m 'update docs'
+          git push
+         
+          
+