Update build-push.yml

Remove private registry in favor of GHCR

.github/workflows/build-push.yml

@@ -24,13 +24,6 @@ jobs:
         id: buildx
         uses: docker/setup-buildx-action@v2
 
-      - name: Login to private registry
-        uses: docker/login-action@v2
-        with:
-          registry: ${{ secrets.REGISTRY_URL }}
-          username: ${{ secrets.REGISTRY_USERNAME }}
-          password: ${{ secrets.REGISTRY_PASSWORD }}
-
       - name: Login to GitHub's container registry
         if: github.event_name != 'pull_request'
         uses: docker/login-action@v2
@@ -46,7 +39,6 @@ jobs:
           # list of Docker images to use as base name for tags
           images: |
             ghcr.io/spoticord/spoticord
-            ${{ secrets.REGISTRY_URL }}/spoticord/spoticord
           # Docker tags based on the following events/attributes
           tags: |
             type=raw,value=latest,enable={{is_default_branch}}