Setup github actions CI

.github/workflows/build.yml

@@ -0,0 +1,36 @@
+name: Build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: Node ${{ matrix.node_version }} on ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+        node_version: [
+            10.x, # EOL: April 2021
+            12.x, # EOL: April 2022
+          ]
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@master
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node_version }}
+
+      - name: Install
+        run: yarn --frozen-lockfile --non-interactive
+
+      - name: Build
+        run: yarn build
+        env:
+          NODE_ENV: production
+
+      - name: Test
+        run: yarn test

README.md

@@ -29,6 +29,9 @@
 	<a href="https://travis-ci.com/thelounge/thelounge"><img
 		alt="Travis CI Build Status"
 		src="https://img.shields.io/travis/com/thelounge/thelounge/master.svg?style=flat-square&maxAge=60"></a>
+	<a href="https://github.com/thelounge/thelounge/actions"><img
+		alt="Build Status"
+		src="https://github.com/thelounge/thelounge/workflows/Build/badge.svg"></a>
 	<a href="https://david-dm.org/thelounge/thelounge"><img
 		alt="Dependencies Status"
 		src="https://img.shields.io/david/thelounge/thelounge.svg?style=flat-square&maxAge=3600"></a>