Install dependencies in WORKDIR/.miktex

[RobertHeim]

gitlab CI does not allow to cache dependencies outside the project directory. Hence, it would be great if the image could store the dependencies within the project dir. This would enable CIs to cache the dependencies that are installed on the fly and thereby make builds much faster.

So if the WORKDIR is set to /miktex/work then the dependencies should be stored, for example, in /miktex/work/.miktex

Then this would work:

image: miktex/miktex

build:
  variables:
    MIKTEX_GID: 1111
    MIKTEX_UID: 1111
  cache:
    paths:
#      - /miktex/.miktex/ <--- not possible to cache dependencies outside the project dir
      - ./miktex <--- this is fine
  script:
    - mpm --update-db
    - pdflatex main.tex
  artifacts:
    paths:
      - "*.pdf"

I think this would not affect other use cases of the image, because they still would need to set a mounted volume and only need to change the path where they mount it. However, it would also be fine if we could configure the image via an environment variable.

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