add basic test and gh action

.github/workflows/build.yml

@@ -0,0 +1,19 @@
+name: Build
+
+on: [push]
+
+jobs:
+  build-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out
+        uses: actions/checkout@v4
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20.x'
+          cache: 'npm'
+      - run: npm ci
+      - run: npm run build
+      - run: npm run test:ci

.gitignore

@@ -12,6 +12,7 @@ dist
 build
 *.local
 .env
+coverage
 
 # Editor directories and files
 .idea