create main.yml GitHub Action pipeline

create a basic pipeline to ensure main branch can be built and passes test (and coverage)

.github/workflows/main.yml

@@ -0,0 +1,40 @@
+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the action will run. 
+on:
+  # Triggers the workflow on push or pull request events but only for the main branch
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+      - name: Setup Node.js environment
+        uses: actions/setup-node@v2.1.5
+        with:
+          node-version: 10.19.0
+      - run: npm ci
+      - run: npm run build
+      - run: npm run test > unit-test.log
+      - uses: actions/upload-artifact@v2
+        with:
+          name: unit test log
+          path: unit-test.log
+          if-no-files-found: 'warn'
+          retention-days: 30
+