chore: use npm provenance

Configures the npm provenance mechanism for the Github release
workflow.

The npm provenance assures consumers of JSON Forms that the
libraries available on npmjs were actually produced by the JSON Forms
project.

.github/workflows/publish.yaml

@@ -24,6 +24,7 @@ jobs:
   publish:
     permissions:
       contents: "write"
+      id-token: "write"
     runs-on: "ubuntu-latest"
     steps:
       - uses: "actions/checkout@v4"
@@ -81,6 +82,7 @@ jobs:
         run: "pnpm publish --recursive ${{  github.event.inputs.stable_release == 'true' && ' ' || '--tag next' }}"
         env:
           NODE_AUTH_TOKEN: "${{ secrets.NPM_TOKEN }}"
+          NPM_CONFIG_PROVENANCE: "true"
 
       - name: "push"
         if: "github.event.inputs.skip_push == 'false'"