removed docker hub registry

.github/workflows/build-and-publish.yml

@@ -14,37 +14,32 @@ on:
     types: [published]
   pull_request:
     branches: [ main ]
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
 jobs:
   push_to_registry:
-    name: Push Docker image to Docker Hub and GitHub Container Registry
+    name: Push Docker image to GitHub Container Registry
     runs-on: ubuntu-latest
     permissions:
       packages: write
       contents: read
     steps:
       - name: Check out the repo
         uses: actions/checkout@v3
-
-      - name: Log in to Docker Hub
-        uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a
-        with:
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_PASSWORD }}
 
       - name: Log in to the Container registry
         uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
         with:
-          registry: ghcr.io
+          registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
         uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
         with:
-          images: |
-            lrlunin/mbi-div-b-notebook
-            ghcr.io/${{ github.repository }}
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
       - name: Build and push Docker image
         uses: docker/build-push-action@3b5e8027fcad23fda98b2e3ac259d8d67585f671