Because "only one process in a container" is a dangerous rule (because it has so many exceptions). In certain cases, that idea makes sense, but you shouldn't contort your app such that you only have one process in every container. Not to mention that there are other issues (PID 1 has unique problems that databases and your app aren't used to having to deal with).
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Because "only one process in a container" is a dangerous rule (because it has so many exceptions). In certain cases, that idea makes sense, but you shouldn't contort your app such that you only have one process in every container. Not to mention that there are other issues (PID 1 has unique problems that databases and your app aren't used to having to deal with).