Since Kubernetes Job spec.template is immutable, Flux cannot update a
completed Job with a new image tag. This change ensures the CI workflow
updates both the image newTag AND the Job metadata.name to include the
short SHA (e.g., migrate-schema-026a2c8), making each deploy's Job
unique and allowing Flux to reconcile consecutive deploys without
immutable field errors.
Co-Authored-By: Paperclip <noreply@paperclip.ing>