diff --git a/debian-cd/Dockerfile b/debian-cd/Dockerfile
index ea1cd42..9bb0d7f 100644
--- a/debian-cd/Dockerfile
+++ b/debian-cd/Dockerfile
@@ -2,7 +2,16 @@ FROM ustcmirror/base:alpine
 LABEL maintainer="Jian Zeng <anonymousknight96 AT gmail.com>"
 LABEL bind_support=true
 VOLUME ["/debian"]
-ADD ["sync.sh", "pre-sync.sh", "prepare.sh", "/"]
+ADD ["sync.sh", "pre-sync.sh", "/"]
 ADD ["jigdo-mirror", "cd-mirror", "/usr/local/bin/"]
 ADD jigdo-mirror.conf.in /etc/jigdo/
-RUN /prepare.sh && rm /prepare.sh
+RUN <<EOF
+set -euo pipefail
+apk add --no-cache wget ca-certificates rsync
+mkdir -p /etc/jigdo
+wget 'https://ftp.lug.ustc.edu.cn/misc/jigdo-bin-0.7.3.tar.bz2'
+echo "58b8a6885822e55f365c99131c906f16ceaaf657c566e10f410d026704cad157  jigdo-bin-0.7.3.tar.bz2" | sha256sum -c -
+tar xf jigdo-bin-0.7.3.tar.bz2 jigdo-bin-0.7.3/jigdo-file
+mv jigdo-bin-0.7.3/jigdo-file /usr/local/bin/
+rm -rf jigdo-bin-*
+EOF
diff --git a/debian-cd/prepare.sh b/debian-cd/prepare.sh
deleted file mode 100755
index 7bc9fb4..0000000
--- a/debian-cd/prepare.sh
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/bin/bash
-set -e
-apk add --no-cache wget ca-certificates rsync
-mkdir -p /etc/jigdo
-wget 'https://ftp.lug.ustc.edu.cn/misc/jigdo-bin-0.7.3.tar.bz2'
-echo "58b8a6885822e55f365c99131c906f16ceaaf657c566e10f410d026704cad157  jigdo-bin-0.7.3.tar.bz2" | sha256sum -c -
-tar xf jigdo-bin-0.7.3.tar.bz2 jigdo-bin-0.7.3/jigdo-file
-mv jigdo-bin-0.7.3/jigdo-file /usr/local/bin/
-rm -rf jigdo-bin-*
diff --git a/ghcup/Dockerfile b/ghcup/Dockerfile
index 53fc7ff..d9523b0 100644
--- a/ghcup/Dockerfile
+++ b/ghcup/Dockerfile
@@ -1,4 +1,22 @@
 FROM ustcmirror/base:debian
 LABEL maintainer="Kai Ma <ksqsf@mail.ustc.edu.cn>"
-ADD ["sync.sh", "prepare.sh", "ghcupsync.hs", "/"]
-RUN bash /prepare.sh && rm prepare.sh
+ADD ["sync.sh", "ghcupsync.hs", "/"]
+RUN --mount=type=cache,sharing=locked,target=/var/cache/apt \
+    --mount=type=cache,sharing=locked,target=/var/lib/apt <<EOF
+#!/bin/bash
+
+HASKELL_DEPS="ghc libghc-aeson-dev libghc-lens-dev libghc-lens-aeson-dev \
+              libghc-network-uri-dev libghc-split-dev libghc-typed-process-dev \
+              libghc-yaml-dev"
+# Please use ldd to check the dependencies of compiled binary
+HASKELL_KEEP="libyaml-0-2"
+
+apt-get update
+apt-get install -y aria2 ca-certificates git curl $HASKELL_DEPS $HASKELL_KEEP
+
+# compile with Haskell language extensions
+ghc -O2 -XScopedTypeVariables -XOverloadedStrings ghcupsync.hs
+
+rm -rf /ghcupsync.* && apt-get purge -y --auto-remove $HASKELL_DEPS
+
+EOF
diff --git a/ghcup/prepare.sh b/ghcup/prepare.sh
deleted file mode 100644
index e92b893..0000000
--- a/ghcup/prepare.sh
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/bash
-set -e
-
-HASKELL_DEPS="ghc libghc-aeson-dev libghc-lens-dev libghc-lens-aeson-dev \
-              libghc-network-uri-dev libghc-split-dev libghc-typed-process-dev \
-              libghc-yaml-dev"
-# Please use ldd to check the dependencies of compiled binary
-HASKELL_KEEP="libyaml-0-2"
-
-apt-get update
-apt-get install -y aria2 ca-certificates git curl $HASKELL_DEPS $HASKELL_KEEP
-
-# compile with Haskell language extensions
-ghc -O2 -XScopedTypeVariables -XOverloadedStrings ghcupsync.hs
-
-rm -rf /ghcupsync.* && apt-get purge -y --auto-remove $HASKELL_DEPS && rm -rf /var/lib/apt/lists/*
diff --git a/stackage/Dockerfile b/stackage/Dockerfile
index c79bbe0..9e4efca 100644
--- a/stackage/Dockerfile
+++ b/stackage/Dockerfile
@@ -1,5 +1,20 @@
 FROM ustcmirror/base:debian
 LABEL maintainer="Jiahao Li <gloit042@gmail.com>"
 LABEL maintainer="Keyu Tao <taoky@ustclug.org>"
-ADD ["sync.sh", "prepare.sh", "stackage.hs", "/"]
-RUN bash /prepare.sh && rm prepare.sh
+ADD ["sync.sh", "stackage.hs", "/"]
+RUN --mount=type=cache,sharing=locked,target=/var/cache/apt \
+    --mount=type=cache,sharing=locked,target=/var/lib/apt <<EOF
+#!/bin/bash
+
+HASKELL_DEPS="ghc libghc-yaml-dev libghc-process-extras-dev \
+              libghc-aeson-dev libghc-split-dev"
+# Please use ldd to check the dependencies of compiled binary
+HASKELL_KEEP="libyaml-0-2"
+
+apt-get update
+apt-get install -y aria2 ca-certificates git $HASKELL_DEPS $HASKELL_KEEP
+ghc -O2 stackage.hs
+
+rm -rf stackage.* && apt-get purge --auto-remove -y $HASKELL_DEPS
+
+EOF
diff --git a/stackage/prepare.sh b/stackage/prepare.sh
deleted file mode 100755
index 53fc91c..0000000
--- a/stackage/prepare.sh
+++ /dev/null
@@ -1,13 +0,0 @@
-#!/bin/bash
-set -e
-
-HASKELL_DEPS="ghc libghc-yaml-dev libghc-process-extras-dev \
-              libghc-aeson-dev libghc-split-dev"
-# Please use ldd to check the dependencies of compiled binary
-HASKELL_KEEP="libyaml-0-2"
-
-apt-get update
-apt-get install -y aria2 ca-certificates git $HASKELL_DEPS $HASKELL_KEEP
-ghc -O2 stackage.hs
-
-rm -rf stackage.* && apt-get purge --auto-remove -y $HASKELL_DEPS && rm -rf /var/lib/apt/lists/*