ci: update github workflows

.github/dependabot.yml

@@ -5,7 +5,7 @@
 
 version: 2
 updates:
-  - package-ecosystem: "" # See documentation for possible values
+  - package-ecosystem: "npm" # See documentation for possible values
     directory: "/" # Location of package manifests
     schedule:
-      interval: "weekly"
+      interval: "monthly"

.github/workflows/main.yml

@@ -0,0 +1,25 @@
+name: Run Tests
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '18'
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+
+      - name: Run Jest tests
+        run: yarn test