feat(sync): add support for sync hostPath

[zxh326]

fix: #56

[Copilot]

Pull Request Overview

Adds support for mounting hostPath volumes in sync workloads by propagating an extraVolumes field through the sink parser, API types, CRD schema, deep-copy functions, and pod builder. Also updates sample YAML to document the new option.

• Propagate ExtraVolumes from SyncSinkExternal to ParsedSyncSink
• Extend API (sync_types.go) and generated deep-copy logic for HostPath
• Modify genSyncVolumes to append hostPath volumes and mounts
• Update CRD schemas and sample manifests to include extraVolumes.hostPath

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/utils/sync.go	Assign external.ExtraVolumes to parsed spec
pkg/builder/sync_pod.go	Generate hostPath volumes and mounts in the pod
config/samples/v1_sync.yaml	Document hostPath example under extraVolumes
config/crd/bases/juicefs.io_syncs.yaml	Add extraVolumes schema, including hostPath
config/crd/bases/juicefs.io_cronsyncs.yaml	Same CRD updates for cron-syncs
api/v1/sync_types.go	Define new HostPath struct and ExtraVolumes
api/v1/zz_generated.deepcopy.go	Generate deep-copy methods for HostPath and slice

Comments suppressed due to low confidence (3)

pkg/builder/sync_pod.go:299

• [nitpick] Using the loop index for volume names may produce unstable names if order changes; consider a deterministic name derived from the hostPath path (e.g., a hash or sanitized path) to avoid potential collisions.

				Name: fmt.Sprintf("hostpath-%d", i),

pkg/builder/sync_pod.go:261

• There aren't any unit tests covering hostPath support in genSyncVolumes; consider adding tests to verify both the volume and mount are generated correctly when ExtraVolumes contains a HostPath entry.

	if s.to.ExtraVolumes != nil {

config/crd/bases/juicefs.io_syncs.yaml:552

• The extraVolumes schema is duplicated in several sections; consider using YAML anchors or a shared definition with $ref to reduce repetition and ease future updates.

                      extraVolumes: