feat: add Docker support with multi-stage build and CI/CD workflow

- Introduced Dockerfile for multi-stage application build and deployment using Nginx.
- Added .dockerignore to exclude unnecessary files from the Docker context.
- Created nginx.conf for server configuration, including Gzip compression and SPA routing.
- Implemented Gitea CI/CD workflow for building and pushing Docker images on version tags.

.gitea/workflows/build.yml

@@ -0,0 +1,48 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: 检出代码
+        uses: actions/checkout@v4
+        
+      - name: 设置 Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        
+      - name: 登录到 Gitea Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.GITEA_INSTANCE_URL }}
+          username: ${{ env.GITEA_ACTOR }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      
+      - name: 提取 Docker 元数据
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ env.GITEA_INSTANCE_URL }}/${{ env.GITEA_REPOSITORY_OWNER }}/litek
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=raw,value=latest
+      
+      - name: 构建并推送 Docker 镜像
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          platforms: linux/amd64,linux/arm64
+