add missing registry and image name

.github/workflows/deploy-docker.yml

@@ -4,6 +4,10 @@ on:
   release:
     types: [published, edited]
 
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
 jobs:
   push_to_registry:
     name: Push Docker image to Docker Hub
@@ -17,17 +21,12 @@ jobs:
       - name: Check out the repo
         uses: actions/checkout@v4
 
-      - name: Log in to Docker Hub
-        uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a
-        with:
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_PASSWORD }}
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
         with:
-          images: my-docker-hub-namespace/my-docker-hub-repository
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
       - name: Build and push Docker image
         id: push