Install Git LFS in release image

[kvz]

Why: the Docker publish helper verifies a clean git tree inside the release image, but that image did not include Git LFS. As a result, LFS-managed fixtures appeared modified inside Docker even when the host checkout was clean, blocking releases.

Changes:

• Install git-lfs in the release Docker image.
• Register Git LFS filters at image build time.

Verification:

• Built the release image for linux/arm64.
• Confirmed the LFS fixtures no longer appear in container git status.
• Ran PYPI_TOKEN=dummy DOCKER_PLATFORM=linux/arm64 ./scripts/notify-registry.sh --dry-run.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.60%. Comparing base (ab9f5cf) to head (6bd09f7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #55   +/-   ##
=======================================
  Coverage   86.60%   86.60%           
=======================================
  Files           7        7           
  Lines         209      209           
  Branches       19       19           
=======================================
  Hits          181      181           
  Misses         28       28           

Flag	Coverage Δ
unittests	86.60% <ø> (ø)

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