XT-2856: Create GitHub workflow to build npm package

.github/workflows/npm-publish.yml

@@ -0,0 +1,37 @@
+name: Build and publish NPM package
+
+on:
+  workflow_dispatch:
+    inputs:
+      node_version:
+        default: '19'
+        description: 'Node version to use'
+        required: true
+        type: string
+
+jobs:
+  build-package:
+    environment: release
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/[email protected]
+        with:
+          fetch-depth: 0 # npm run prod requires tags, sadly this is the only way to get them.
+      - uses: actions/setup-node@v3
+        with:
+          node-version: ${{ inputs.node_version }}
+          registry-url: 'https://registry.npmjs.org' # Must explicitly set this for NODE_AUTH_TOKEN to work below
+      - name: Install dependencies
+        run: npm install --include=dev
+      - name: Test with npm
+        run: npm run test
+      - name: Build with npm
+        run: npm run prod
+      - name: Publish with npm
+        if: startsWith(github.ref, 'refs/tags')
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+        run: |
+          npm config set git-tag-version=false
+          npm version $(git describe --tags)
+          npm publish --access public