chore: add unit test workflow

.github/workflows/e2e.yml

@@ -1,9 +1,9 @@
 name: e2e
 on:
   push:
-    branches: [main, master]
+    branches: main
   pull_request:
-    branches: [main, master]
+    branches: main
 jobs:
   test:
     timeout-minutes: 60

.github/workflows/unit.yml

@@ -0,0 +1,29 @@
+name: unit
+
+on:
+  push:
+    branches: main
+  pull_request:
+    branches: main
+
+env:
+  NODE_VERSION: '20.9.0'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          registry-url: 'https://registry.npmjs.org/'
+          node-version: ${{ env.NODE_VERSION }}
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run karma tests
+        run: npx ng test --watch=false