如何避免在.gitlab-ci.yml的每个阶段之前安装requirements.txt？

Question

I have a .gitlab-ci.yml which looks like this:

image: "python:3.7"

before_script:
  - pip install -r requirements.txt

stages:
  - stageA
  - stageB

stage_a:
  stage: stageA
  script:
  - run_some_python_scripts

stage_b:
  stage: stageB
  script:
  - run_more_python_scripts

With this setup, requirements.txt is installed before every stage. I need it installed only once, such that both stageA and stageB can use.

How can I achieve this?

Answer 1

One option I've found that works great if the requirements.txt file doesn't change much, is to bake it into your own Docker image.

Another option which I personally don't like as much, is to use a virtualenv and then use GitLab's cache on the virtualenv , however this can be a bit slow if there are a lot of pip packages.