Initial import

.github/workflows/main.yml

@@ -0,0 +1,26 @@
+on:
+  push:
+    branches:
+      - main
+
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18
+          cache: yarn
+
+      - run: yarn install --immutable
+      - run: yarn build
+
+      - name: Verify that `yarn build` did not change outputs
+        run: git diff --exit-code
+
+      - run: yarn test
+      - run: yarn lint