fix: extract pnpm version from packageManager field instead of returning undefined (#216)

When packageManager is set to e.g. "pnpm@9.1.0+sha...", strip the
"pnpm@" prefix and any "+sha..." hash suffix so the action installs
the correct version. Previously returning undefined caused failures
on Windows.

dist/index.js

@@ -264,7 +264,7 @@ ${r.comment}`:r.comment}this.doc.range[2]=r.offset;break}default:this.errors.pus
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   - version ${e} in the GitHub Action config with the key "version"
   - version ${i} in the package.json with the key "packageManager"
-Remove one of these versions to avoid version mismatch errors like ERR_PNPM_BAD_PM_VERSION`);return e}if(!(typeof i=="string"&&i.startsWith("pnpm@")))throw n?new Error(`No pnpm version is specified.
+Remove one of these versions to avoid version mismatch errors like ERR_PNPM_BAD_PM_VERSION`);return e}if(typeof i=="string"&&i.startsWith("pnpm@"))return i.replace("pnpm@","").replace(/\+.*$/,"");throw n?new Error(`No pnpm version is specified.
 Please specify it by one of the following ways:
   - in the GitHub Action config with the key "version"
   - in the package.json with the key "packageManager"`):new Error(`No workspace is found.

src/install-pnpm/run.ts

@@ -101,8 +101,8 @@ Remove one of these versions to avoid version mismatch errors like ERR_PNPM_BAD_
   }
 
   if (typeof packageManager === 'string' && packageManager.startsWith('pnpm@')) {
-    // pnpm will handle version management via packageManager field
-    return undefined
+    // Strip the "pnpm@" prefix and any "+sha..." hash suffix
+    return packageManager.replace('pnpm@', '').replace(/\+.*$/, '')
   }
 
   if (!GITHUB_WORKSPACE) {