Collecting envs needs improvement

[adambabik]

The current env detection is very naive:

• It uses env > file for the env snapshot before running the command and the same for the env snapshot after.
• It does not work well if a command is interrupted or fails; consider using trap instead.
• It dumps env on a disk; it would be much better to avoid that. Maybe use some IPC?

[adambabik]

It dumps env on a disk; it would be much better to avoid that.

@sourishkrout @mxsdev If we don't know a simple and reliable way to avoid this at the moment, we can at least encrypt what is being dumped. An encryption key can be generated and stored in memory while a request is being processed. This should be fairly easy to implement and it will greatly improve the situation.