Add npm publish workflow

Triggered on version tags (v*). Builds, tests, then publishes all
packages to npm using NPM_TOKEN secret.

Author: SimplyLiz

.github/workflows/publish.yml

@@ -0,0 +1,34 @@
+name: Publish
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: pnpm
+          registry-url: https://registry.npmjs.org
+
+      - run: pnpm install --frozen-lockfile
+
+      - run: pnpm build
+
+      - run: pnpm test
+
+      - run: pnpm -r publish --no-git-checks --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}