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for activating a virtual environment, I highly recommend checking out direnv. It has good integration with Emacs through direnv-mode, but also will handle your shell stuff for you. Pretty much fixed a lot of my tooling problems.
I am a bit curious about how one could do the shell-command thing though. In dir-locals you can exec code, but I think that would execute on every file that you open (which is probably not what you want)
Thank you, I will take a look at direnv. The idea is to run the command once indeed. I know there is hooks when switching project, but how to use them here is out of my knowledge.
One thing I found is that projectile-switch-project-action is the action invoked after switching to a project. This defaults to projectile-file-file, but you might be able to make a function that spawns the process (if it doesn't exist already of course) and then call projectile-find-file.
(figured this out by scrolling through projectile.el and looking for switch-project)
I posted this question on Doom emacs #help 's discord, and someone suggested to use: projectile-after-switch-project-hook
I'm not sure if I can place it inside my dir-locals.el, that hook could be evaluated before reading dir-locals and if I'm correct nothing would happen so.
Anyway, those are good starting points, I will take a look and if I find a solution, come back here to let you know.