remove broken platforms

nodejs/docker-node#1946

Author: dumbasPL

.github/workflows/build.yml

@@ -49,7 +49,7 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64/v8
+          platforms: linux/amd64,linux/arm64/v8
 
       - name: Docker Hub Description
         uses: peter-evans/dockerhub-description@v4