fix: use exec to replace pid 1 shell with process #52
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As reported in #51, some containers have a shell as PID 1.
This PR uses
execto replace the shell with the invoked process as PID 1.This doesn't completely solve #51 since PID 1 is expected to handle signals in a way that non-PID 1 processes are not. For that we should still try to roll dumb-init into all images.