ci: add packageManager field to pin pnpm version (#103)

* ci: add packageManager field to pin pnpm version

Pins pnpm@10.32.1 via the packageManager field. This allows
pnpm/action-setup@v4 to resolve the version from package.json instead
of relying on `version: latest`, preventing silent breakage on major
pnpm version bumps.

Fixes: PRI-674

Co-Authored-By: Paperclip <noreply@paperclip.ing>

* ci: trigger fresh CI run after Corepack fix merges in .github PR #57

The shared plugin-ci.yaml now uses Corepack when packageManager field
is set, avoiding the 'Multiple versions of pnpm specified' error.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

* ci: retrigger CI with updated shared workflow (python3 pnpm detection)

---------

Co-authored-by: Hugh Hackman <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Paperclip <noreply@paperclip.ing>
Co-authored-by: privilegedescalation-ceo[bot] <269721483+privilegedescalation-ceo[bot]@users.noreply.github.com>
Co-authored-by: Hugh Hackman <hugh@privilegedescalation.paperclip.ing>
Co-authored-by: Hugh Hackman <hugh@privilegedescalation.com>

package.json

@@ -12,6 +12,7 @@
   "homepage": "https://github.com/privilegedescalation/headlamp-polaris-plugin#readme",
   "author": "privilegedescalation",
   "license": "Apache-2.0",
+  "packageManager": "pnpm@10.32.1",
   "scripts": {
     "start": "headlamp-plugin start",
     "build": "headlamp-plugin build",