ci: add GitHub Actions CI/CD pipelines

- Add ci.yml with lint, typecheck, test, build steps + PostgreSQL service
- Add deploy.yml scaffold with Docker build placeholders

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/ci.yml

@@ -0,0 +1,68 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  ci:
+    name: Lint → Typecheck → Test → Build
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [22]
+
+    services:
+      postgres:
+        image: postgis/postgis:16-3.4
+        env:
+          POSTGRES_DB: goodgo_test
+          POSTGRES_USER: goodgo
+          POSTGRES_PASSWORD: goodgo_test_secret
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd "pg_isready -U goodgo -d goodgo_test"
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+          --health-start-period 30s
+
+    env:
+      DATABASE_URL: postgresql://goodgo:goodgo_test_secret@localhost:5432/goodgo_test
+      NODE_ENV: test
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Lint
+        run: pnpm lint
+
+      - name: Typecheck
+        run: pnpm typecheck
+
+      - name: Test
+        run: pnpm test
+
+      - name: Build
+        run: pnpm build