ops：切换离线发布为本地构建上传

backend/Dockerfile

@@ -15,6 +15,8 @@ COPY . .
 ARG TARGETOS=linux
 ARG TARGETARCH=amd64
 
+FROM builder AS suite-builder
+
 # 1. 统一构建所有需要部署的后端服务二进制，避免每个服务维护一份 Dockerfile。
 # 2. 输出目录固定为 /out，便于运行时镜像按命令复用同一套产物。
 RUN --mount=type=cache,target=/root/.cache/go-build \
@@ -23,7 +25,17 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
       CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o "/out/${service}" "./cmd/${service}"; \
     done
 
-FROM ${RUNTIME_IMAGE} AS runtime
+FROM builder AS service-builder
+
+ARG SERVICE=api
+
+# 1. 服务级镜像只编译一个入口，减少单服务发布时需要上传的二进制体积。
+# 2. SERVICE 必须对应 backend/cmd 下的目录；构建失败会直接暴露错误，避免发布错误镜像。
+RUN --mount=type=cache,target=/root/.cache/go-build \
+    mkdir -p /out && \
+    CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o "/out/${SERVICE}" "./cmd/${SERVICE}"
+
+FROM ${RUNTIME_IMAGE} AS runtime-base
 
 WORKDIR /app/backend
 
@@ -33,10 +45,23 @@ RUN apt-get update \
     && apt-get install -y --no-install-recommends ca-certificates tzdata \
     && rm -rf /var/lib/apt/lists/*
 
-COPY --from=builder /out /app/bin
 COPY config.docker.yaml /app/backend/config.docker.yaml
 
 ENV TZ=Asia/Shanghai
 ENV SMARTFLOW_CONFIG_FILE=/app/backend/config.docker.yaml
 
+FROM runtime-base AS runtime-suite
+
+COPY --from=suite-builder /out /app/bin
+
 CMD ["/app/bin/api"]
+
+FROM runtime-base AS runtime-service
+
+ARG SERVICE=api
+
+COPY --from=service-builder /out/${SERVICE} /app/bin/${SERVICE}
+
+CMD ["/app/bin/api"]
+
+FROM runtime-suite AS runtime