Make Docker Hub login required in CI

Author: mpartipilo

.github/workflows/test-on-weaviate-version.yml

@@ -56,7 +56,6 @@ jobs:
 
       - name: Login to Docker Hub
         uses: docker/login-action@v3
-        continue-on-error: true
         if: ${{ !github.event.pull_request.head.repo.fork && github.triggering_actor != 'dependabot[bot]' }}
         with:
           username: ${{ secrets.DOCKER_USERNAME }}