Is your feature request related to a problem?
When using kubernetes provider, source files from the local folder are copied to the remote devcontainer deployed in a pod within the cluster.

If I build the app in local, I generate the output folder with the binary and many other things that are not needed to be copied in the devcontianer. However, If I start the container, those files/folders are also copied.

In my case it was ~1GB it was copied being very slow.

Which solution do you suggest?
Add a .devpodignore where you can define which files/folder to ignore when copying the source code.