Set up CI

.github/workflows/test.yaml

@@ -0,0 +1,28 @@
+name: Test
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Erlang & Elixir
+        uses: erlef/setup-elixir@v1
+        with:
+          otp-version: '23.2'
+          elixir-version: '1.11.3'
+      - name: Install mix dependencies
+        run: mix deps.get
+      - name: Run tests
+        run: mix test
+      - name: Install Node
+        uses: actions/setup-node@v2
+        with:
+          node-version: '14.x'
+      - name: Install npm dependencies
+        run: npm ci --prefix assets
+      - name: Run tests
+        run: npm test --prefix assets

assets/package.json

@@ -6,7 +6,8 @@
     "deploy": "NODE_ENV=production webpack --mode production",
     "watch": "webpack --mode development --watch",
     "format": "prettier --trailing-comma es5 --write {js,test,css}/**/*.{js,json,css,scss,md}",
-    "test": "jest --watch"
+    "test": "jest",
+    "test:watch": "jest"
   },
   "dependencies": {
     "marked": "^1.2.8",