Add automated NPM release workflow via CodeArtifact

Adds publish-npm.yml using the shared mapbox/gha CodeArtifact releaser
and adds a build script stub to package.json.

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

Author: oielbanna

.github/workflows/publish-npm.yml

@@ -0,0 +1,22 @@
+name: NPM release
+
+on:
+  pull_request:
+    branches: [ master ]
+    types:
+      - opened
+      - synchronize
+      - reopened
+      # Triggers the workflow when labels change in the PR
+      - labeled
+      - unlabeled
+  push:
+    branches:
+      - master
+
+jobs:
+  npm-release:
+    uses: mapbox/gha/.github/workflows/workflow-release-npm-package-codeartifact.yml@workflow-release-npm-package-codeartifact-v1
+    secrets: inherit
+    with:
+      test: false

README.md

@@ -76,3 +76,12 @@ a DynamoDB table.
 ## Documentation
 
 See API.md for documentation of the JavaScript client, and use `dyno --help` for details on CLI usage.
+
+## Releasing
+
+The `@mapbox/dyno` NPM package is released automatically via GitHub Actions using a label-based workflow.
+
+To release a new version:
+1. Open a pull request with your changes.
+2. Add a label (`patch`, `minor`, `major`, `prerelease`, or `no-release`) to control the version bump.
+3. Once the PR is merged to `master`, the `NPM release` workflow will automatically bump the version, update the CHANGELOG, publish to CodeArtifact, and create a GitHub Release.

package.json

@@ -7,6 +7,7 @@
     "node": ">=16"
   },
   "scripts": {
+    "build": "echo 'No build step required'",
     "pretest": "eslint bin lib test index.js",
     "test": "nyc tape test/*.test.js",
     "docs": "documentation build index.js -f md > API.md",