better cleanup for smaller images

scripts/bootstrap-to-docker.sh

@@ -219,10 +219,12 @@ EOF1
             fi
             sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true update
             sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true -y dist-upgrade
-            echo " ----    cleanup ${instpkgs} to ${tmpdir}/${distro}-${arch}" 1>&2
-            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true autoremove --purge -y
             echo " ----    install ${instpkgs} to ${tmpdir}/${distro}-${arch}" 1>&2
             sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true install -y ${instpkgs}
+            echo " ----    cleanup ${instpkgs} to ${tmpdir}/${distro}-${arch}" 1>&2
+            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true autoremove --purge -y
+            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true clean
+	    sudo rm -rf "${tmpdir}/${distro}-${arch}"/var/lib/apt/lists/*
             echo " ----    unmount filesystems in ${tmpdir}/${distro}-${arch}" 1>&2
             for x in proc sys dev; do
                 if mount | grep -q "${tmpdir}/${distro}-${arch}"/$x; then