download from node-versions and fallback to node dist (#147)

* download LTS versions from releases

* support upcoiming ghes 

Co-authored-by: eric sciple <ericsciple@users.noreply.github.com>

.github/workflows/build-test.yml

@@ -0,0 +1,32 @@
+name: build-test
+
+on:
+  pull_request:
+    paths-ignore:
+      - '**.md'    
+  push:    
+    branches:
+      - master
+      - releases/*
+    paths-ignore:
+      - '**.md'
+      
+jobs:
+  build:
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: [ubuntu-latest, windows-latest]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup node 12
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+      - run: npm ci
+      - run: npm run build
+      - run: npm run format-check
+      - run: npm test
+      - name: Verify no unstaged changes
+        if: runner.os != 'windows'
+        run: __tests__/verify-no-unstaged-changes.sh