ci: add GitHub Actions workflow for automatic Firebase frontend deploy

.github/workflows/deploy-frontend.yml

@@ -0,0 +1,57 @@
+name: 🚀 Deploy Frontend → Firebase Hosting
+
+# Se activa en cada push a la rama main
+# SOLO cuando hay cambios en el frontend (no re-despliega si solo cambió el backend)
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'frontend/**'
+      - '.github/workflows/deploy-frontend.yml'
+
+jobs:
+  build-and-deploy:
+    name: Build & Deploy a Firebase
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: frontend
+
+    steps:
+      # 1. Clonar el repositorio
+      - name: 📥 Checkout del repositorio
+        uses: actions/checkout@v4
+
+      # 2. Configurar Node.js
+      - name: ⚙️  Setup Node.js 22
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: 'npm'
+          cache-dependency-path: frontend/package-lock.json
+
+      # 3. Instalar dependencias
+      - name: 📦 Instalar dependencias (npm ci)
+        run: npm ci
+
+      # 4. Crear el archivo .env.production con las variables del repositorio
+      #    Estas variables las defines en: GitHub → Settings → Secrets and variables → Actions
+      - name: 🔐 Crear .env.production desde GitHub Secrets
+        run: |
+          echo "VITE_API_URL=${{ secrets.VITE_API_URL }}" > .env.production
+          echo "VITE_GOOGLE_MAPS_API_KEY=${{ secrets.VITE_GOOGLE_MAPS_API_KEY }}" >> .env.production
+
+      # 5. Compilar el frontend para producción
+      - name: 🔨 Build de producción (Vite)
+        run: npm run build
+
+      # 6. Deploy a Firebase Hosting
+      - name: 🚀 Deploy a Firebase Hosting
+        uses: FirebaseExtended/action-hosting-deploy@v0
+        with:
+          repoToken: ${{ secrets.GITHUB_TOKEN }}
+          firebaseServiceAccount: ${{ secrets.FIREBASE_SERVICE_ACCOUNT }}
+          channelId: live
+          projectId: sibu2-0-transport-2026
+          entryPoint: './frontend'