install git into container

Author: daringer

.github/workflows/build.yml

@@ -28,9 +28,12 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
 
-      - name: additional sphinx install
-        run: pip3 install -r requirements.txt
-
+      - name: additional env setup
+        run: |
+          pip3 install -r requirements.txt
+          apt-get -y update
+          apt-get -y install git
+          
       - name: quick build docs
         run: |
           mkdir -p dist/en