Update Docker Buildx setup in ghcr.yml

.github/workflows/ghcr.yml

@@ -37,9 +37,15 @@ jobs:
         uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      # This step uses the `docker/setup-buildx-action` action to set up the Docker Buildx builder. This is required to build and push multi-platform images.
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
       # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
       # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.
+
       - name: Build and push Docker image
         uses: docker/build-push-action@v5
         with: