我制作了一个docker 映像，以便将它与我在 Wercker 中的项目构建一起使用，我这样做是因为我认为已经在环境中安装了 require 包比在我的项目的每个构建中都安装它们要好。
但是，现在 Wercker 每次构建我的项目时都会失败，原因是什么？超时，因为设置环境步骤需要 5 分钟以上。
Running wercker version: 1.0.405 (Compiled at: 2016-02-10T22:17:21Z, Git commit: b44ceb57f107c85dbaa619c6d89592b979f69b5b)
Using config:
box: shackra/latex-ebook
build:
steps:
- script:
name: Documento en formato PDF
code: |
xelatex --version
# twice, please
xelatex biblia.tex
xelatex biblia.tex
- script:
name: Subir documentos a Bitbucket
code: |
./upload-to-bitbucket.sh $BITBUCKET_U $BITBUCKET_P /straubingerdigital/biblia-platense/downloads biblia.pdf
Pulling from shackra/latex-ebook: latest
Pulling fs layer: e627a276e4dc
Pulling fs layer: 16c1e3a61000
Pulling fs layer: 80bc33a4179a
Pulling fs layer: d23822bfcf6d
Pulling fs layer: 4fdf7f1f2966
Pulling fs layer: f6a9cd9eb099
Pulling fs layer: 85a462562b69
Pulling fs layer: 73a2d7fa1951
Pulling fs layer: 56fffce111ea
Verifying Checksum: 16c1e3a61000
Download complete: 16c1e3a61000
Verifying Checksum: 56fffce111ea
Download complete: 56fffce111ea
Verifying Checksum: 80bc33a4179a
Download complete: 80bc33a4179a
Verifying Checksum: d23822bfcf6d
Download complete: d23822bfcf6d
Verifying Checksum: 4fdf7f1f2966
Download complete: 4fdf7f1f2966
Verifying Checksum: 85a462562b69
Download complete: 85a462562b69
Verifying Checksum: 73a2d7fa1951
Download complete: 73a2d7fa1951
Verifying Checksum: e627a276e4dc
Download complete: e627a276e4dc
Pull complete: e627a276e4dc
Pull complete: 16c1e3a61000
Pull complete: 80bc33a4179a
Pull complete: d23822bfcf6d
Pull complete: 4fdf7f1f2966
Verifying Checksum: f6a9cd9eb099
Download complete: f6a9cd9eb099
Pull complete: f6a9cd9eb099
Pull complete: 85a462562b69
Pull complete: 73a2d7fa1951
Pull complete: 56fffce111ea
Digest: sha256:af688a72e89b3a97b5b4d28509291a30be7a6d4b0067180f46f5d97da22679c8
Status: Downloaded newer image for shackra/latex-ebook:latest
它只是停留在那里Status: Downloaded newer image for shackra/latex-ebook:latest，这里出了什么问题？我可以从我的 Wercker 配置文件中修复什么吗？