fix: export mise path entries to subsequent steps

[jdx]

Summary

• restore activation-like propagation of mise-produced PATH entries to subsequent workflow steps
• add only the PATH prefix introduced by mise through GITHUB_PATH, without exporting the runner's complete computed PATH through GITHUB_ENV
• enable PATH export by default for compatibility with behavior users relied on before v4.2.1
• add export_path: false as an explicit opt-out
• cover configured PATH ordering across Linux, macOS, Windows, and Alpine, plus the opt-out behavior

Root cause

v4.2.1 correctly stopped exporting the complete PATH returned by mise env --json, which had snapshotted the runner environment into GITHUB_ENV. However, removing PATH entirely also removed [env] _.path and other mise-produced path entries that users relied on in subsequent steps.

This change computes the prefix that mise added to the action's existing PATH and forwards those directories individually using the GitHub Actions PATH environment file. It retains mise's configured ordering while avoiding the unsafe full-PATH export.

Addresses #565.

Validation

• aube install
• aubr all
• mise x actionlint@1.7.12 shellcheck@0.11.0 -- actionlint .github/workflows/test.yml
• mise x shellcheck@0.11.0 -- shellcheck scripts/test.sh

This pull request was generated by Codex.

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Note

Medium Risk
Touches how every workflow step sees PATH after setup; logic is nuanced (prefix vs set-diff) but defaults preserve prior behavior and CI covers ordering and opt-out.

Overview
Restores activation-like PATH propagation for subsequent workflow steps after v4.2.1 stopped exporting PATH entirely. The action now derives only the prefix mise added to the current PATH (tools, [env] _.path, etc.) and appends those entries through GITHUB_PATH, instead of writing the full computed PATH into GITHUB_ENV.

Adds export_path (default true) so workflows can keep regular env exports while opting out of PATH changes. Dotenv fallbacks strip PATH from GITHUB_ENV and still export additions via JSON when needed.

CI creates ordered PATH fixtures across the matrix and adds a path_opt_out job; scripts/test.sh checks [env] _.path ordering persists in later steps.

^{Reviewed by Cursor Bugbot for commit 30d9042. Bugbot is set up for automated code reviews on this repo. Configure here.}

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Review details

⚙️ Run configuration

Configuration used: Central YAML (base), Organization UI (inherited)

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Run ID: bb3fafbb-b5da-4d43-897f-550bc26e0ba1

📥 Commits

Reviewing files that changed from the base of the PR and between f10502f and 30d9042.

⛔ Files ignored due to path filters (2)

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

📒 Files selected for processing (5)

• .github/workflows/test.yml
• README.md
• action.yml
• scripts/test.sh
• src/index.ts

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[greptile-apps]

Greptile Summary

Restores propagation of mise-produced PATH entries to subsequent workflow steps.

• Filters PATH from legacy dotenv output instead of writing the complete computed PATH to GITHUB_ENV.
• Adds mise-specific PATH entries through GITHUB_PATH, with an export_path opt-out.
• Updates action metadata, documentation, bundled artifacts, and cross-platform workflow tests.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains within the scope of the previous review thread.

Important Files Changed

Filename	Overview
src/index.ts	Separates PATH from regular environment export, filters PATH from legacy dotenv output, and propagates mise-added entries through GITHUB_PATH.
action.yml	Declares the new export_path input and updates the env input contract.
.github/workflows/test.yml	Adds PATH-ordering fixtures and verifies the legacy-version opt-out behavior.
scripts/test.sh	Updates integration assertions to require mise-configured PATH precedence.
dist/index.js	Includes the bundled runtime implementation corresponding to the TypeScript changes.

_{Reviews (2): Last reviewed commit: "fix: filter path from dotenv fallback" | Re-trigger Greptile}