fix: configure npm auth via .npmrc before publish

npm publish requires an .npmrc with the auth token configured.
The NPM_TOKEN env var alone isn't sufficient.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: anandgupta42

.github/workflows/release.yml

@@ -57,6 +57,11 @@ jobs:
           name: dist
           path: packages/altimate-code/dist/
 
+      - name: Configure npm auth
+        run: echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" > ~/.npmrc
+        env:
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+
       - name: Publish to npm
         run: bun run packages/altimate-code/script/publish.ts
         env: