Replace Docker with generic container keyword

Author: PythonGermany

.github/workflows/docker-cd.yml

@@ -30,7 +30,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      # Login against a Docker registry except on PR
+      # Login against a container registry except on PR
       # https://github.com/docker/login-action
       - name: Log into registry ${{ env.REGISTRY }}
         if: github.event_name != 'pull_request'