GA Workflow: publish javascript clients

* unfortunately, there's no nice way to put this workflow inside the
  /clients/javascript directory itself, so we have to use prefixes
  to namespace it.

.github/workflows/clients-javascript-publish.yml

@@ -0,0 +1,26 @@
+name: Publish JavaScript Client
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  build:
+    name: Publish package to NPM
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      id-token: write
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: '20.x'
+          registry-url: 'https://registry.npmjs.org'
+      - run: npm install -g npm
+      - run: npm ci
+      - run: npm publish --provenance --access public --dry-run
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}