skaffold support for podman login store

### Expected behavior
`podman login `
`skaffold build`
skaffold is able to build and push images
(podmans docker compatibility is enabled, so builds work fine)

### Actual behavior
skaffold fails on missing registry credentials, as it can't find `$XDG_RUNTIME_DIR/containers/auth.json`

### Information

- Skaffold version: v2.13.2
- Operating system: Fedora 41
- Installed via: github release
- Contents of skaffold.yaml:

```yaml
apiVersion: skaffold/v4beta4
kind: Config
metadata:
name: podman test

build:
tagPolicy:
gitCommit:
variant: CommitSha
ignoreChanges: true

artifacts:
- image:
context: .
docker:
dockerfile: ./container_images/Containerfile
buildArgs:
GIT_HASH: "{{.GIT.COMMIT}}"
```