pub-mirror: fix docker build

dockerfiles/pub-mirror/Dockerfile

@@ -1,4 +1,49 @@
-FROM google/dart:2
+FROM debian:stable AS dart-build
+
+ARG DART_VERSION="2.12.4"
+
+WORKDIR /tmp/
+
+RUN \
+  apt-get -q update && apt-get install --no-install-recommends -y -q \
+    gnupg2 curl git ca-certificates unzip openssh-client && \
+  case "$(uname -m)" in armv7l | armv7) ARCH="arm";; aarch64) ARCH="arm64";; *) ARCH="x64";; esac && \
+  curl -O https://storage.googleapis.com/dart-archive/channels/stable/release/$DART_VERSION/sdk/dartsdk-linux-$ARCH-release.zip && \
+  unzip dartsdk-linux-$ARCH-release.zip -d /usr/lib/ && \
+  rm dartsdk-linux-$ARCH-release.zip && \
+  mv /usr/lib/dart-sdk /usr/lib/dart && \
+  chmod -R "og+rX" /usr/lib/dart
+
+ENV DART_SDK /usr/lib/dart
+ENV PATH $DART_SDK/bin:/root/.pub-cache/bin:$PATH
+WORKDIR /root
+
+RUN set -eux; \
+  ( case "$(uname -m)" in \
+    armv7l | armv7) ARCH="arm-linux-gnueabihf" ; \
+      echo "/lib/ld-linux-armhf.so.3" ; \
+      echo "/lib/arm-linux-gnueabihf/ld-linux-armhf.so.3" ;; \
+    aarch64) ARCH="aarch64-linux-gnu" ; \
+      echo "/lib/ld-linux-aarch64.so.1" ; \
+      echo "/lib/aarch64-linux-gnu/ld-linux-aarch64.so.1" ;; \
+    *) ARCH="x86_64-linux-gnu" ; \
+      echo "/lib64/ld-linux-x86-64.so.2" ;; \
+  esac; \
+  echo "/etc/nsswitch.conf"; \
+  echo "/etc/ssl/certs"; \
+  echo "/usr/share/ca-certificates"; \
+  echo "/bin/bash"; echo "/bin/sh"; \
+  for i in libc.so.6 libdl.so.2 libm.so.6 libnss_dns.so.2 libpthread.so.0 \
+    libresolv.so.2 librt.so.1 libtinfo.so.6; do \
+    echo "/lib/$ARCH/$i"; \
+  done \
+  ) | while read p; do \
+    dir="$(dirname "$p")"; \
+    mkdir -p "/runtime$dir"; \
+    cp --archive --link --dereference --no-target-directory "$p" "/runtime$p"; \
+  done
+
+FROM dart-build
 MAINTAINER Hui Yiqun <i@huiyiqun.me>
 
 ENV PUB_CACHE /pub-cache