If determinate is false, pass --prefer-upstream

[grahamc]

Description

Checklist

• Tested changes against a test repository
• Added or updated relevant documentation (leave unchecked if not applicable)
• (If this PR is for a release) Updated README to point to the new tag (leave unchecked if not applicable)

Summary by CodeRabbit

• Chores
  • Updated Nix installer configuration to v3.11.3 and increased required Nix version to 2.32.0.
  • Adjusted installer behavior to prefer upstream Nix when using non-determinate installation mode.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The PR updates GitHub Actions CI workflow configuration to migrate from nix-installer v0.18.0 to v3.11.3 and increases required Nix version to 2.32.0. It also introduces a new flag constant to prefer upstream Nix in the installer arguments when the determinate mode is disabled.

Changes

Cohort / File(s)	Change Summary
CI Configuration Updates .github/workflows/ci.yml	Migrates nix-installer from v0.18.0 to v3.11.3 across both install-nix and install-with-non-default-source-inputs matrices; updates Nix version requirement from 2.21.2/2.19.2 to 2.32.0; removes separate revision blocks and consolidates into url/nix-version pairs.
Installer Flag Addition src/index.ts	Adds new FLAG_PREFER_UPSTREAM_NIX constant and incorporates it into installerArgs() method logic; when determinate mode is disabled, the flag is appended to installer arguments.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Configuration updates are straightforward version/URL migrations with consistent patterns across matrices
• TypeScript change introduces a single new constant with basic conditional logic in one code path
• No complex interactions or ambiguous logic requiring deep analysis

Poem

🐰 A rabbit hops through nix so bright,
With v3.11.3 in sight!
New flags to prefer upstream's way,
When determinate takes holiday—
Our installer springs forth with delight!

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch push-ysltloqzrqsn

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 45a18a6 and f647679.

⛔ Files ignored due to path filters (1)

• dist/index.js is excluded by !**/dist/**

📒 Files selected for processing (2)

• .github/workflows/ci.yml (1 hunks)
• src/index.ts (2 hunks)

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