ci: install without the pnpm store cache

Restoring the store replays Electron's postinstall from cached output rather
than extracting the download, and that copy flattens the symlinks inside
Electron Framework.framework. codesign then reports the bundle format as
ambiguous and refuses to verify the signature.

Author: Ldsystem

.github/workflows/release.yml

@@ -35,10 +35,14 @@ jobs:
       # Reads the pinned version from package.json's packageManager field.
       - uses: pnpm/action-setup@v4
 
+      # Deliberately uncached. Restoring the pnpm store replays Electron's
+      # postinstall from cached output instead of extracting the download, and
+      # that copy flattens the symlinks inside Electron Framework.framework.
+      # codesign then calls the bundle ambiguous and refuses to verify it, so
+      # the minute this saves costs the release its signature.
       - uses: actions/setup-node@v4
         with:
           node-version: 22
-          cache: pnpm
 
       - run: pnpm install --frozen-lockfile