File overwrite fails with ignition format

[hardys]

What happened:

During deployment it's possible to define additional files with a configuration like the following, which when using cloud-init results in default behavior to overwrite any existing files

---
apiVersion: bootstrap.cluster.x-k8s.io/v1alpha1
kind: RKE2ConfigTemplate
metadata:
  name: sample-cluster-workers
  namespace: default
spec:
  template:
    spec:
      files:
        - path: "/etc/motd"
          owner: "root:root"
          permissions: "0640"
          content: |
            hello 123

The behavior with format: ignition however is different and any attempt to overwrite an existing file will fail during the OS firstboot:

[   17.691712] worker-0 ignition[1180]: Ignition failed: failed to create files: failed to create files: error creating /sysroot/etc/motd: error creating file "/sysroot/etc/motd": A file exists there already and overwrite is false

What did you expect to happen:
The behavior between cloud-init and ignition should be consistent from the perspective of the user of the RKE2 provider API, even if the default behavior of the underlying tool may be different.

I think we can likely adapt the configuration during the translation from cloud-init to butane/ignition so that we set the overwrite flag to true.

How to reproduce it:
Deploy with a similar configuration described above and format: ignition

Environment:
I reproduced using Leap Micro 6.0 with CAPM3.

[hardys]

I'll work on a fix for this, please assign to me thanks!