feat: add option to disable shims in PATH (#340)

## Summary
- Add `add_shims_to_path` input (default: `true`) to control whether the
mise shims directory is added to PATH
- Setting this to `false` allows users who already have mise configured
to avoid conflicts with their existing setup

Fixes #337

## Usage
```yaml
- uses: jdx/mise-action@v2
  with:
    add_shims_to_path: false
```

## Test plan
- [ ] Verify shims are added to PATH by default (existing behavior)
- [ ] Verify shims are NOT added to PATH when `add_shims_to_path: false`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Adds `add_shims_to_path` input (default true) to optionally skip
adding `mise/shims` to PATH.
> 
> - **Action input/behavior**
>   - Add `inputs.add_shims_to_path` (default: `true`).
> - Conditionally add `mise/shims` to `PATH` only when
`add_shims_to_path` is `true`.
> - **Build/dist updates (non-functional to action API)**
> - Minor runtime tweaks in bundled libs: safer `abortSignal`
reassignment, improved `File` stream creation, user-agent OS field
formatting, `randomUUID` fallback for Node, and updated internal SDK
version constants.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
f90b26afa3. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

action.yml

@@ -67,6 +67,10 @@ inputs:
     required: false
     default: "false"
     description: if true, will run `mise reshim --all` after setting up mise
+  add_shims_to_path:
+    required: false
+    default: "true"
+    description: if false, will not add mise shims directory to PATH
   github_token:
     required: false
     description: |

dist/index.js

@@ -50155,9 +50155,11 @@ async function setEnvVars() {
     }
     set('MISE_TRUSTED_CONFIG_PATHS', process.cwd());
     set('MISE_YES', '1');
-    const shimsDir = path.join(miseDir(), 'shims');
-    core.info(`Adding ${shimsDir} to PATH`);
-    core.addPath(shimsDir);
+    if (core.getBooleanInput('add_shims_to_path')) {
+        const shimsDir = path.join(miseDir(), 'shims');
+        core.info(`Adding ${shimsDir} to PATH`);
+        core.addPath(shimsDir);
+    }
 }
 async function restoreMiseCache() {
     core.startGroup('Restoring mise cache');

src/index.ts

@@ -187,9 +187,11 @@ async function setEnvVars(): Promise<void> {
   set('MISE_TRUSTED_CONFIG_PATHS', process.cwd())
   set('MISE_YES', '1')
 
-  const shimsDir = path.join(miseDir(), 'shims')
-  core.info(`Adding ${shimsDir} to PATH`)
-  core.addPath(shimsDir)
+  if (core.getBooleanInput('add_shims_to_path')) {
+    const shimsDir = path.join(miseDir(), 'shims')
+    core.info(`Adding ${shimsDir} to PATH`)
+    core.addPath(shimsDir)
+  }
 }
 
 async function restoreMiseCache(): Promise<string | undefined> {