chore(ci): setup GitHub workflow

Author: buschtoens

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: CI
+
+# These trigger patterns courtesy of https://github.com/broccolijs/broccoli/pull/436
+on:
+  pull_request:
+  push:
+    # filtering branches here prevents duplicate builds from pull_request and push
+    branches:
+      - master
+      - "v*"
+    # always run CI for tags
+    tags:
+      - "*"
+
+env:
+  CI: true
+
+jobs:
+  test-locked-deps:
+    name: Locked Deps
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v1
+      - name: Install Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - name: Install Dependencies
+        run: yarn install --frozen-lockfile
+      - name: Lint
+        run: yarn lint:js
+      - name: Browser Tests
+        run: yarn test