feat: add LFS snapshot support to git strategy#191
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When lfs-snapshot-enabled is true, cachew generates a separate LFS object
snapshot (lfs-snapshot.tar.zst) alongside the regular git snapshot. This
archives .git/lfs/objects/ after running git lfs fetch, and serves it at
GET /git/{repo}/lfs-snapshot.tar.zst.
Adds snapshot.CreateSubdir for archiving a named subdirectory with its
path prefix preserved in the tar. LFS snapshot jobs are scheduled on both
startup discovery and first clone of new repos.
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When
lfs-snapshot-enabled = truein the git strategy block, cachew generates a separate LFS object archive on each snapshot interval, served atGET /git/{host}/{path}/lfs-snapshot.tar.zst.After each git snapshot,
generateAndUploadLFSSnapshotclones the mirror into a temp dir, injects a short-lived GitHub App token, runsgit lfs fetch origin HEAD, then archives the resulting.git/lfs/tree. Paths inside the archive are stored relative to.git/(i.e../lfs/objects/xx/yy/sha256), so a client can extract directly into the repo's.git/directory. The archive is served via the existingserveCachedArtifacthelper with standard 200/304/404 behaviour.A new
snapshot.CreateSubdirhelper in the snapshot package supports archiving a named subdirectory within a parent directory while preserving the subdirectory prefix in tar paths.LFS snapshot jobs run on the same periodic schedule as git snapshots and are registered for both newly cloned repos and repos discovered on startup.