feat: add ci for frontend and backend

.github/workflows/ci.yml

@@ -0,0 +1,70 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  frontend:
+    name: Frontend CI
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./frontend
+    steps:
+      - uses: actions/checkout@v4
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+      - name: Code Quality (Biome)
+        run: bun run check
+      - name: Type Check & Build
+        run: bun run build
+
+  backend:
+    name: Backend CI
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./backend
+    services:
+      postgres:
+        image: postgres:16-alpine
+        env:
+          POSTGRES_DB: piku
+          POSTGRES_USER: atom
+          POSTGRES_PASSWORD: password123
+        ports:
+          - 5432:5432
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5  # wait till up before starting (integrating) django app
+    env:
+      DB_NAME: piku
+      DB_USER: atom
+      DB_PASSWORD: password123
+      DB_HOST: localhost
+      DB_PORT: 5432
+      SECRET_KEY: ci-test-secret-key
+      DEBUG: True
+      FRONTEND_URL: http://localhost:5173
+      CORS_ALLOWED_ORIGINS: http://localhost:5173
+      EMAIL_HOST: localhost
+      EMAIL_PORT: 1025
+      FROM_EMAIL: ci@pi-ku.app
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          version: "latest"
+          enable-cache: true
+          cache-dependency-glob: backend/uv.lock
+      - name: Install dependencies
+        run: uv sync
+      - name: Lint (Ruff)
+        run: uv run ruff check
+      - name: Run Tests
+        run: uv run python manage.py test