Fix docker login

Signed-off-by: Nicolas Bock <nicolas.bock@canonical.com>

.github/workflows/docker-publish.yaml

@@ -42,17 +42,16 @@ jobs:
 
       - name: Test and Build
         run: make all
-  
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
       - name: Log into registry ${{ env.REGISTRY }}
-        if: github.event_name != 'pull_request'
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Extract Docker metadata - processor
         id: processor_meta