Add Github actions (stephenh#83)

.github/workflows/build.yml

@@ -0,0 +1,31 @@
+name: Build
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [12.x, 14.x]
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: install dependencies
+        run: yarn install || echo "ignore failure"
+      - name: pbjs
+        run: ./pbjs.sh
+      - name: Prepare Integration
+        run: ./integration/pbjs.sh
+      - name: test
+        run: yarn test
+        env:
+          CI: true

README.markdown

@@ -1,6 +1,7 @@
 
 [![npm](https://img.shields.io/npm/v/ts-proto)](https://www.npmjs.com/package/ts-proto)
 [![CircleCI](https://circleci.com/gh/stephenh/ts-proto.svg?style=svg)](https://circleci.com/gh/stephenh/ts-proto)
+![]https://github.com/stephenh/ts-proto/workflows/Build/badge.svg)
 
 # ts-proto