ci: npm test 추가 + Docker GHCR 빌드/푸시 + SSH 배포 추가

- test job: lint + vitest + build
- docker job: main 머지 시 nginx 이미지 빌드/푸시
- deploy job: SSH로 docker compose pull web && up

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: CI
+name: CI/CD
 
 on:
   push:
@@ -7,7 +7,8 @@ on:
     branches: [main]
 
 jobs:
-  build:
+  # ── 1. 린트 + 테스트 + 빌드 ────────────────────────────────────────────────
+  test:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -23,7 +24,56 @@ jobs:
       - name: Lint
         run: npm run lint
 
+      - name: Test
+        run: npm test
+
       - name: Build
         run: npm run build
         env:
           VITE_API_BASE_URL: https://a301.api.tolelom.xyz
+
+  # ── 2. Docker 빌드 & GHCR 푸시 (main 머지 시만) ───────────────────────────
+  docker:
+    needs: test
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: docker/setup-buildx-action@v3
+
+      - uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ghcr.io/${{ github.repository_owner }}/a301-web:latest
+          platforms: linux/arm64
+          build-args: |
+            VITE_API_BASE_URL=https://a301.api.tolelom.xyz
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+  # ── 3. 서버 배포 (Docker 푸시 완료 후) ────────────────────────────────────
+  deploy:
+    needs: docker
+    runs-on: ubuntu-latest
+    steps:
+      - uses: appleboy/ssh-action@v1
+        with:
+          host: ${{ secrets.SERVER_HOST }}
+          username: ${{ secrets.SERVER_USER }}
+          key: ${{ secrets.SSH_PRIVATE_KEY }}
+          script: |
+            export PATH=$PATH:/usr/local/bin:/opt/homebrew/bin:$HOME/.docker/bin
+            cd ~/server
+            docker compose pull web
+            docker compose up -d web