ci: add GitHub Actions workflows for frontend and backend

Author: eddyseed

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: Node.js CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  frontend:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install frontend deps
+        run: npm install
+        working-directory: frontend
+      - name: Check ESLint Errors
+        run: npm run lint
+        working-directory: frontend
+      - name: Build frontend
+        run: npm run build
+        working-directory: frontend
+  backend:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install backend deps
+        run: npm install
+        working-directory: backend
+      - name: Run backend tests
+        run: npm test
+        working-directory: backend