CI: npm provenance publishing with OIDC

Author: lgutschow

.github/workflows/ci.yml

@@ -23,12 +23,15 @@ jobs:
     needs: test
     if: startsWith(github.ref, 'refs/tags/v')
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v4
         with:
           node-version: '20'
           registry-url: 'https://registry.npmjs.org'
-      - run: npm publish --tag alpha
+      - run: npm publish --provenance --tag alpha
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}