use dart container

Author: tmthecoder

.github/workflows/docbot.yml

@@ -8,12 +8,10 @@ jobs:
  update-docs:
 
    runs-on: ubuntu-latest
-
+   container:
+     image:  google/dart:latest
    steps:
    - uses: actions/checkout@v2
-   - uses: cedx/[email protected]
-     with: 
-      release-channel: beta
    - name: Install dependencies
      run: pub get
    - name: Generate Documentation