如何使Travis条件构建阶段工作?

我的目标是在Travis流程中有三个步骤:

1. 测试(始终)
2. 生成(docker映像,仅当合并分支时 进入开发阶段)
3. 部署(与构建相同)

我读过 documentation on build stages and conditionals 但我似乎误解了什么,因为Travis总是执行所有三个阶段(例如,当我推一个功能分支时)。

我当前的设置如下:

jobs:
  include:
    - stage: test
      script: ".travis/01-test.sh"
    - stage: build
      script: ".travis/02-build-and-push-image.sh"
      if: (branch = develop) AND (NOT(type IN (push, pull_request)))
    - stage: deploy
      script: ".travis/03-deploy.sh staging"
      if: (branch = develop) AND (NOT(type IN (push, pull_request)))

当我打开Travis构建页面上的config选项卡时,我可以看到这个配置,所以它不应该是一个解析错误。我也尝试过分别列出作业和阶段,但结果是一样的:

jobs:
  include:
    - stage: test
      script: ".travis/01-test.sh"
    - stage: build
      script: ".travis/02-build-and-push-image.sh"
    - stage: deploy
      script: ".travis/03-deploy.sh staging"
stages:
  - test
  - name: build
    if: (branch = develop) AND (NOT(type IN (push, pull_request)))
  - name: deploy
    if: (branch = develop) AND (NOT(type IN (push, pull_request)))

我怎样才能做到这一点?我错过什么了吗?我知道构建阶段是一个beta特性,但我认为这应该已经可以工作了,根据 Travis blog post .