[Feature] Include markdown in docker image

[Jakan-Kink]

Is your feature request related to a problem? Please describe.
As part of a feature request we worked on in Fanscrape we added markdown handling to clean the titles. However the way we implemented it requires the python module markdown.

Describe the solution you'd like
Add the python module markdown to the docker image, so that way users don’t need to go into the docker container and add it manually every release.

Describe alternatives you've considered
As mentioned in solution, the user could install markdown manually but that gets cumbersome each stash update.

[DogmaDragon]

There are no plans to add any new modules to the official Docker image. There is a project #4300 to overhaul the current image to move module installation to the entry scripts, as just increasing the image size is not practical and far from ideal.

[feederbox826]

override your pip install directory, and it will persist

[feederbox826]

also why not just regex for ** instead of addng an entire library?

[Jakan-Kink]

Yea, I’ll just update the readme to point to the venv / python path instructions