ci: add cd action to publish to npm

.github/workflows/cd.yml

@@ -0,0 +1,21 @@
+name: CD
+
+on:
+    release:
+        # This specifies that the build will be triggered when we publish a release
+        types: [published]
+
+jobs:
+    build:
+        name: Publish to NPM
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+            - uses: actions/setup-node@v1
+              with:
+                  node-version: 14.x
+                  registry-url: https://registry.npmjs.org/
+            - run: yarn install
+            - run: npm publish --access public
+              env:
+                  NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}