Add hint for Docker Hub registry name

Docker hub uses aliases, so provide a hint for folks who want to push or pull private images.
vmware-archive · Feb 16, 2021 · c185ebc · c185ebc
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commit c185ebc
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diff --git a/README.md b/README.md
@@ -98,6 +98,8 @@ kubectl create secret docker-registry mysecret --docker-server='<registry hostna
 kubectl build --push --registry-secret mysecret -t <registry hostname>/<namespace>/<repo>:<tag> -f Dockerfile ./
 ```
 
+Hint: if you're trying to authenticate to Docker Hub, use `https://index.docker.io/v1/` as the `--docker-server`
+
 ### Registry-based Caching
 
 BuildKit is smart about caching prior build results for efficient incremental