Dockerfile

ARG GO_BASE_IMAGE=golang:1.24-alpine
# Docker buildx 会自动提供这些构建参数
# 如果使用传统 docker build，这些参数可能未设置
ARG TARGETPLATFORM
ARG BUILDPLATFORM
ARG TARGETOS=linux
ARG TARGETARCH

# 如果 BUILDPLATFORM 未设置，则不指定 --platform（使用默认）
FROM ${GO_BASE_IMAGE} AS builder

ENV GOPROXY=https://goproxy.cn,direct

WORKDIR /src

COPY go.mod go.sum ./
RUN go mod download

COPY . .

# 根据目标架构交叉编译
# TARGETOS 和 TARGETARCH 由 Docker buildx 自动提供
# 如果 TARGETARCH 未设置（使用传统 docker build），则使用当前架构
RUN set -e && \
    if [ -z "$TARGETARCH" ]; then \
        export TARGETARCH=$(go env GOARCH); \
    fi && \
    echo "Building for GOOS=${TARGETOS} GOARCH=${TARGETARCH}" && \
    CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} \
    go build -trimpath -ldflags "-s -w" -o /out/go-pac .

FROM scratch AS runner

WORKDIR /opt/go-pac

COPY --from=builder /out/go-pac /opt/go-pac/go-pac
COPY config.yaml /opt/go-pac/

EXPOSE 80

ENTRYPOINT ["/opt/go-pac/go-pac"]
CMD ["-port", "80"]