add initial action

.github/workflows/main.yml

@@ -0,0 +1,17 @@
+name: Node.js CI
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '20.x'
+      - run: npm ci
+      - run: npm run build --if-present
+      - run: npm test
+

package.json

@@ -9,7 +9,7 @@
 		"prepublishOnly": "npm run package",
 		"check": "svelte-kit sync && svelte-check --tsconfig ./jsconfig.json",
 		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./jsconfig.json --watch",
-		"test": "vitest",
+		"test": "vitest run",
 		"lint": "prettier --plugin-search-dir . --check .",
 		"format": "prettier --plugin-search-dir . --write ."
 	},