Running VS code on Ubuntu 20.10

Based on this guide:

https://code.visualstudio.com/docs/remote/attach-container#_attach-to-a-container-in-a-kubernetes-cluster

I am trying to attach to a running container in a k8s cluster and edit a file in that container using vs code:

As a result another vs code instance opens but prints this error:

[2260 ms] 
[2261 ms] mkdir: cannot create directory '/var/www': Permission denied
[2261 ms] Exit code 1
[2274 ms] Command in container failed: mkdir -p /var/www/.vscode-server/bin/054a9295330880ed74ceaedda236253b4f39a335_1621844063707

Looks like its trying to create that directory in the remote container but is that necessary to connect and open/edit a file on the remote container in vs code?

Or is it somehow possible to specify a path for where to store this content inside the container with adequate permissions?