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I worked out how to do it. I just cated the file out as the last command. So my local.Command looked like this.

const kubeConfigFile = pulumi.getStack() === "prod" ? "./kube/config" : "./kube/config-dev"
const kubeconfg = new local.Command("copy-kubeconfig", {
  create: pulumi.interpolate`
  mkdir -p ./kube
  scp -o StrictHostKeyChecking=no -i "${tlsKey.privateKeyOpenssh}" root@${k3sMaster1.ipv4Address}:/etc/rancher/k3s/k3s.yaml ${kubeConfigFile}
  sed -i 's/127.0.0.1/${k3sMaster1.ipv4Address}/' ${kubeConfigFile}
  cat ${kubeConfigFile}
  `
}, {
  dependsOn: [k3sMaster1Install]
})

Then I used the stdout as export for my output.

module.exports = {
  kubeconfig: kubeconfg.stdout.apply(x => x.toString()),
}

Not sure if the

apply

is required, but it works.