[BUG] Indirect transfer using rsync image without rclone fails with an unclear error message

[nachandr]

What version of crane are you running, and what are your clutsters+platform
latest from main branch on KIND clusters

Description
If the rsync image predates rclone support , crane accepts the image,
creates the destination PVC, launches the upload pod, and the container fails to start with
exec: "rclone": executable file not found in $PATH.

crane does fail and returns a non-zero exit code like expected , but:

1. there is no pre-flight check that --source-image contains an rclone
   binary,
2. the top-level error does not name the root cause — it reports only
   upload pod failed: pod <ns>/rclone-upload-<pvc> failed, and
3. the failure is reached only after the destination PVC is created (a
   committed side effect → orphan), and only after the mover pod reaches a
   terminal state.

What did you expect to happen?

What actually happened?

Please include any relevant logs or errors