Docker workflow

.github/workflows/main.yml

@@ -7,6 +7,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3   
+    - uses: actions/setup-python@v4
+      with:
+        python-version: "3.11.0"    
     - name: Build the Docker image
       run: |
         echo "${{ secrets.DOCKER_HUB_TOKEN }}" | docker login -u "${{ secrets.DOCKER_HUB_USERNAME }}" --password-stdin docker.io