ci: add npm environment to release workflow (#73)

Adds `environment: npm` so npm publishes show up under GitHub
Deployments alongside PyPI and GitHub Pages.

Author: jpr5

.github/workflows/publish-release.yml

@@ -6,6 +6,7 @@ on:
 jobs:
   release:
     runs-on: ubuntu-latest
+    environment: npm
     steps:
       - uses: actions/checkout@v4
         with: { fetch-depth: 0 }