Add Dockerfile

Dockerfile

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+# ============================================
+# Multi-stage Dockerfile for gotest
+# Stage 1: Build (Go 1.25)
+# Stage 2: Runtime (minimal Alpine)
+# ============================================
+
+# ---- Build Stage ----
+FROM golang:1.25-alpine AS builder
+
+# 安装必要的构建工具
+RUN apk add --no-cache git ca-certificates tzdata
+
+WORKDIR /build
+
+# 利用 Docker 层缓存：先拷贝依赖文件，再下载依赖
+COPY go.mod go.sum ./
+RUN go mod download
+
+# 拷贝源代码
+COPY . .
+
+# 构建：CGO_ENABLED=0 纯静态二进制，适合 scratch/alpine
+# 前端模板通过 //go:embed 已嵌入二进制
+ENV CGO_ENABLED=0 GOOS=linux GOARCH=amd64
+RUN go build -ldflags="-s -w" -o gotest .
+
+# ---- Runtime Stage ----
+FROM alpine:3.20
+
+# 安装最小运行时依赖
+RUN apk add --no-cache ca-certificates tzdata
+
+# 设置时区
+ENV TZ=Asia/Shanghai
+
+# 创建非 root 用户运行
+RUN addgroup -S app && adduser -S app -G app
+
+# 创建数据和上传目录
+RUN mkdir -p /app/data /app/uploads && chown -R app:app /app
+
+WORKDIR /app
+
+# 从构建阶段拷贝二进制和配置
+COPY --from=builder /build/gotest .
+COPY --from=builder /build/config.yaml .
+
+# 切换非 root 用户
+USER app
+
+# 暴露端口
+EXPOSE 8080
+
+# 健康检查
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+    CMD wget -q -O- http://localhost:8080/api/health || exit 1
+
+# 启动
+ENTRYPOINT ["./gotest"]