Is your feature request related to a problem? Please describe.
We use sidekick as a sidecar. Once the "main container" finishes, we want sidecar to also finish . To achieve that we have another sidecar that monitors the main process. Once that is gone, it sends kill -15 to sidekick. However sidekick does not exit with code 0.

Describe the solution you'd like
I would like sidekick to finish gracefully (exit 0) if it receives a term signal.

Describe alternatives you've considered
Wrapped it into a trap, but there is no trap. The other option is to build our own docker image that has more tools.