fix: preserve dynamo cargo rustflags during source install

[weireweire]

Summary

• stop overriding Cargo rustflags via RUSTFLAGS during dynamo source installs
• append -C target-cpu=native via maturin --config so repo-defined rustflags stay intact
• preserve .cargo/config.toml settings such as tokio_unstable for top-of-tree builds

Verification

• minimal Python import check of DynamoConfig command generation
• pytest not available in this environment

Summary by CodeRabbit

• Chores
  • Optimized Python package installation build configuration to enable native CPU optimizations during the build process.

[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request modifies the Python Dynamo bindings build process in src/srtctl/core/schema.py. Instead of exporting the RUSTFLAGS environment variable before invoking maturin, the rustflags are now embedded directly within maturin's configuration using the --config flag with native CPU target optimization.

Changes

Cohort / File(s)	Summary
Build Configuration src/srtctl/core/schema.py	Modified maturin build invocation to embed build.rustflags=["-C","target-cpu=native"] via --config flag instead of exporting RUSTFLAGS environment variable.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• PR #80: Directly conflicts with this change—PR #80 adds the RUSTFLAGS export before maturin, while this PR replaces that approach by embedding the flag in maturin's configuration instead.

Poem

🐰 A rustling flag finds its home so neat,
No env vars needed, the config's complete,
Maturin builds native, swift and true,
Embedded and clever—a better breakthrough! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly describes the main change: preserving Cargo rustflags during source installation by switching from RUSTFLAGS environment variable to maturin --config approach.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@src/srtctl/core/schema.py`:
- Line 730: The file fails CI formatting due to the string line containing
"maturin build --config 'build.rustflags=[\"-C\",\"target-cpu=native\"]' -o /tmp
&& "; fix by running the project formatter as suggested (run: `uv run ruff
format --write src/srtctl/`) or apply equivalent ruff/black formatting to
src/srtctl/core/schema.py so the offending string and surrounding lines are
reformatted to match the code style.

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d6545e58-2609-4d7f-9769-809205666c0d

📥 Commits

Reviewing files that changed from the base of the PR and between 9fff275 and 5cd2b52.

📒 Files selected for processing (1)

• src/srtctl/core/schema.py

[coderabbitai]

⚠️ Potential issue | 🟡 Minor

Fix formatting to pass CI pipeline.

The pipeline reports that this file needs reformatting: "1 file would be reformatted: src/srtctl/core/schema.py."

Run uv run ruff format --write src/srtctl/ to fix the formatting issue.

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@src/srtctl/core/schema.py` at line 730, The file fails CI formatting due to
the string line containing "maturin build --config
'build.rustflags=[\"-C\",\"target-cpu=native\"]' -o /tmp && "; fix by running
the project formatter as suggested (run: `uv run ruff format --write
src/srtctl/`) or apply equivalent ruff/black formatting to
src/srtctl/core/schema.py so the offending string and surrounding lines are
reformatted to match the code style.