初始化 proxy 打包项目，对齐 xxxig 矿工项目

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docker/Dockerfile.ubuntu

@@ -0,0 +1,49 @@
+# 使用 Ubuntu 20.04 作为基础镜像（glibc 2.31，兼容更老系统）
+FROM ubuntu:20.04 AS base
+
+ARG TARGETARCH
+ARG BUILDPLATFORM
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get install -y \
+    git \
+    wget \
+    build-essential \
+    cmake \
+    libuv1-dev \
+    libssl-dev \
+    libhwloc-dev \
+    openssl \
+    && rm -rf /var/lib/apt/lists/*
+
+FROM base AS build
+
+ARG XXXIG_PROXY_VERSION
+ARG TARGETARCH
+ARG BUILDPLATFORM
+ARG TARGETPLATFORM
+
+RUN git clone --recursive https://github.com/wangdefaa/xxxig-proxy.git && \
+    cd xxxig-proxy && \
+    git checkout ${XXXIG_PROXY_VERSION}
+
+WORKDIR /xxxig-proxy
+
+# 根据目标架构优化编译
+RUN mkdir build && cd build && \
+    if [ "$BUILDPLATFORM" != "$TARGETPLATFORM" ]; then \
+        MAKE_JOBS="-j2"; \
+    else \
+        MAKE_JOBS="-j$(nproc)"; \
+    fi && \
+    echo "Building with parallel jobs: $MAKE_JOBS (cross-compile: $([ "$BUILDPLATFORM" != "$TARGETPLATFORM" ] && echo yes || echo no))" && \
+    cmake .. -DCMAKE_BUILD_TYPE=Release && \
+    make $MAKE_JOBS
+
+FROM scratch
+
+ARG TARGETARCH
+
+COPY --from=build /xxxig-proxy/build/xxxig-proxy /linux_${TARGETARCH}/xxxig-proxy
+COPY --from=build /xxxig-proxy/src/config.json /linux_${TARGETARCH}/config.json