ci: add test workflow

.github/workflows/test.yml

@@ -0,0 +1,30 @@
+# Workflow for running linting, tests etc
+
+name: Test
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+
+env:
+  NODE_VERSION: '20'
+
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Test
+        run: npm run test