Remove Docker Hub auth and debug step

Confirmed secrets are length 0 from CI runners. Docker Hub auth
cannot work until secrets are properly scoped to these repos.

Refs: CAR-77

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/ci.yml

@@ -68,20 +68,6 @@ jobs:
             type=sha,prefix=sha-
             type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}
 
-      - name: Debug Docker Hub secrets
-        run: |
-          echo "DOCKERHUB_USERNAME length: ${#DOCKERHUB_USERNAME}"
-          echo "DOCKERHUB_TOKEN length: ${#DOCKERHUB_TOKEN}"
-        env:
-          DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
-          DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
-
-      - name: Log in to Docker Hub
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-
       - name: Build and push Docker image
         uses: docker/build-push-action@v6
         with: