🔧 Add CI workflow

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: JoshLuedeman

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: "🎭 Backstage CI"
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  build-and-test:
+    name: "🏗️ Build & Test"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: "yarn"
+
+      - name: Install Dependencies
+        run: yarn install --frozen-lockfile
+
+      - name: TypeScript Check
+        run: yarn tsc
+
+      - name: Build
+        run: yarn build:all
+
+      - name: Lint
+        run: yarn lint:all
+
+      - name: Test
+        run: yarn test