build(docker): support configurable package mirrors

Assisted-by: Codex:GPT-5

Dockerfile

@@ -1,10 +1,15 @@
 # syntax=docker/dockerfile:1
 # Build frontend on the native platform to avoid QEMU-related issues with nodejs ecosystem
 FROM --platform=$BUILDPLATFORM docker.io/library/golang:1.26-alpine3.24 AS frontend-build
-RUN apk --no-cache add build-base git nodejs pnpm
+ARG ALPINE_MIRROR=""
+ARG NPM_REGISTRY=""
+RUN if [ -n "$ALPINE_MIRROR" ]; then sed -i "s|https://dl-cdn.alpinelinux.org/alpine|$ALPINE_MIRROR|g" /etc/apk/repositories; fi && \
+    apk --no-cache add build-base git nodejs pnpm
 WORKDIR /src
 COPY package.json pnpm-lock.yaml pnpm-workspace.yaml ./
-RUN --mount=type=cache,target=/root/.local/share/pnpm/store pnpm install --frozen-lockfile
+RUN --mount=type=cache,target=/root/.local/share/pnpm/store \
+    if [ -n "$NPM_REGISTRY" ]; then pnpm config set registry "$NPM_REGISTRY"; fi && \
+    pnpm install --frozen-lockfile
 COPY --exclude=.git/ . .
 RUN make frontend
 
@@ -15,9 +20,13 @@ ARG GITEA_VERSION
 ARG TAGS=""
 ENV TAGS="bindata timetzdata $TAGS"
 ARG CGO_EXTRA_CFLAGS
+ARG ALPINE_MIRROR=""
+ARG GOPROXY=https://proxy.golang.org,direct
+ENV GOPROXY=$GOPROXY
 
 # Build deps
-RUN apk --no-cache add \
+RUN if [ -n "$ALPINE_MIRROR" ]; then sed -i "s|https://dl-cdn.alpinelinux.org/alpine|$ALPINE_MIRROR|g" /etc/apk/repositories; fi && \
+    apk --no-cache add \
     build-base \
     git
 
@@ -48,7 +57,9 @@ FROM docker.io/library/alpine:3.24 AS gitea
 
 EXPOSE 22 3000
 
-RUN apk --no-cache add \
+ARG ALPINE_MIRROR=""
+RUN if [ -n "$ALPINE_MIRROR" ]; then sed -i "s|https://dl-cdn.alpinelinux.org/alpine|$ALPINE_MIRROR|g" /etc/apk/repositories; fi && \
+    apk --no-cache add \
     bash \
     ca-certificates \
     curl \

contrib/roncarve/compose.production.yaml

@@ -3,6 +3,10 @@ services:
     build:
       context: ../..
       dockerfile: Dockerfile
+      args:
+        ALPINE_MIRROR: https://mirrors.aliyun.com/alpine
+        GOPROXY: https://goproxy.cn,direct
+        NPM_REGISTRY: https://registry.npmmirror.com
     image: roncarve/gita:1.27.2-production
     container_name: gitea
     hostname: git.roncarve.com