Adding package publish workflow & testing on multiple Node versions.

Author: jthomas

.github/workflows/check-build.yml

@@ -3,11 +3,15 @@ on: [push, pull_request]
 jobs:
   build-and-test-ts:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node: [ '12', '14', '16' ]
+    name: Node ${{ matrix.node }} build & test
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          node-version: '14'
+          node-version: ${{ matrix.node }}
       - run: npm ci
       - run: npm run lint
       - run: npm test

.github/workflows/publish-release.yml

@@ -0,0 +1,17 @@
+name: Publish NPM Package
+on:
+  release:
+    types: [published]
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v2
+      with:
+        node-version: '14'
+        registry-url: 'https://registry.npmjs.org'
+    - run: npm ci
+    - run: npm publish
+      env:
+        NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}