Break gateway build cycle with runtime base bootstrap

Dockerfile.runtime-base

@@ -1,12 +1,24 @@
 ARG BASE_IMAGE=mirror.gcr.io/library/debian:bookworm-slim
 FROM ${BASE_IMAGE}
 ARG SINGBOX_VERSION=1.12.13
+ARG HTTP_PROXY
+ARG HTTPS_PROXY
+ARG NO_PROXY
+ARG http_proxy
+ARG https_proxy
+ARG no_proxy
 
-RUN apt-get update \
+RUN export http_proxy="${http_proxy:-${HTTP_PROXY:-}}" \
+    && export https_proxy="${https_proxy:-${HTTPS_PROXY:-}}" \
+    && export no_proxy="${no_proxy:-${NO_PROXY:-}}" \
+    && apt-get update \
     && apt-get install -y --no-install-recommends ca-certificates curl iptables ipset iproute2 nodejs dumb-init \
     && rm -rf /var/lib/apt/lists/*
 
 RUN set -eux; \
+    export http_proxy="${http_proxy:-${HTTP_PROXY:-}}"; \
+    export https_proxy="${https_proxy:-${HTTPS_PROXY:-}}"; \
+    export no_proxy="${no_proxy:-${NO_PROXY:-}}"; \
     arch="$(dpkg --print-architecture)"; \
     case "$arch" in \
     amd64) sb_arch="amd64" ;; \