Running several processes in a container is the norm.

I'm highly aware. The reason the word "process" is quoted in my highly down-voteable comment is the misuse of the term "process" by Docker et al. to mean "application." Google the "one process per container" mantra to see what I mean. Somehow the Docker crowd were oblivious to the 60+ year old concept of and terminology related to OS processes when they promulgated their guidance on how containers should be used.

I try not to indulge too many hang-ups in life, but that particular bit of damage is insufferable.