LMDB (5c) Run both FS backend and LMDB backend in Github Actions

[subygan]

enable running all tests with both LMDB and File system

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 63e86433-fd8d-46d2-bbe1-7ceee68cb19f

📥 Commits

Reviewing files that changed from the base of the PR and between 52fcd6e and 7584484.

📒 Files selected for processing (1)

• .github/workflows/ci_test.yml

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📝 Walkthrough

Summary by CodeRabbit

• Tests
  • Expanded automated Rust test coverage in CI with an additional test run to improve reliability and catch more failures without stopping at the first error.

Walkthrough

A new CI step is added to the rust-test job that sets OXEN_MERKLE_NODE_BACKEND=lmdb and runs cargo nextest run --no-fail-fast, executing after the existing Rust test steps.

LMDB Backend CI Step

Layer / File(s)	Summary
LMDB backend test step .github/workflows/ci_test.yml	Adds a cargo nextest run step with OXEN_MERKLE_NODE_BACKEND=lmdb and --no-fail-fast to the rust-test job.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A rabbit hops through CI lanes,
With LMDB now in the chains,
No fail-fast slows the warren down,
Each test gets run without a frown,
🐇 Merkle trees in lmdb bloom!

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the CI change to run tests against both the file system and LMDB backends.
Description check	✅ Passed	The description is directly related and correctly states the goal of running tests with both backends.
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 ENG-1159/CI-lmdb-tests

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