fix(docker): keep git metadata in build context

[panos-xyz]

Summary

• stop excluding .git from the Docker build context
• allow vergen-git2 in crates/node/build.rs to discover repository metadata
• preserve the real commit SHA and version metadata in Docker-built binaries

Without .git, VERGEN_GIT_SHA and related variables are absent and the Docker build fails with Error: NotPresent.

Validation

• reproduced the failure with a minimal Docker context probe: COPY .git was rejected by .dockerignore
• verified the probe passes after the change
• built the real builder image with Docker on linux/arm64 using the profiling profile
• ran morph-reth --version in the image and verified its commit SHA matches the branch commit
• cargo fmt --all -- --check
• cargo test --all --locked

This PR is intentionally limited to the Docker metadata fix and contains no issue #152 diagnostic changes.

Summary by CodeRabbit

• Chores
  • Updated build configuration to retain Git metadata during container builds.
  • Added documentation explaining that Git information is used to include version details.

[claude]

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 5427b335-1019-499b-8325-3bad1437ce76

📥 Commits

Reviewing files that changed from the base of the PR and between 7db29dd and 91a7452.

📒 Files selected for processing (1)

• .dockerignore

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📝 Walkthrough

Walkthrough

The Docker build context now includes .git/. Comments document that vergen-git2 uses Git metadata to embed version information and related environment variables.

Changes

Docker build metadata

Layer / File(s)	Summary
Preserve Git metadata .dockerignore	The .git/ ignore rule was removed. Comments document the build-time Git metadata requirement for vergen-git2.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 91a74

This localized Docker build-context change preserves repository metadata so binaries retain the correct commit information, with the reported validation passing; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: retaining Git metadata in the Docker build context.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-docker-vergen-git-metadata

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