add "publish" workflow

Author: phryneas

.github/workflows/publish.yaml

@@ -0,0 +1,24 @@
+name: Publish Package to npmjs
+on:
+  # keeping it purely manual for now as to not accidentally trigger a release
+  #release:
+  #  types: [published]
+  workflow_dispatch:
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      contents: read
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: '18.x'
+          registry-url: 'https://registry.npmjs.org'
+          cache: 'yarn'
+      - run: yarn install --frozen-lockfile
+      - run: yarn test
+      - run: npm publish --access public --provenance
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}