Added gh pages aauto push

Author: C-Achard

.github/workflows/build_docs.yml

@@ -14,4 +14,25 @@ jobs:
     - uses: ammaraskar/sphinx-action@master
       with:
         pre-build-command: "pip install -r dev.requirements.txt"
-        docs-folder: "docs/"
+        docs-folder: "docs/"
+        # Publish built docs to gh-pages branch.
+    # ===============================
+    - name: Commit documentation changes
+      run: |
+        git clone https://github.com/ammaraskar/sphinx-action-test.git --branch gh-pages --single-branch gh-pages
+        cp -r docs/_build/html/* gh-pages/
+        cd gh-pages
+        touch .nojekyll
+        git config --local user.email "[email protected]"
+        git config --local user.name "GitHub Action"
+        git add .
+        git commit -m "Update documentation" -a || true
+        # The above command will fail if no changes were present, so we ignore
+        # that.
+    - name: Push changes
+      uses: ad-m/github-push-action@master
+      with:
+        branch: gh-pages
+        directory: gh-pages
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+    # ===============================